diff --git a/core/src/main/java/google/registry/beam/spec11/ThreatMatch.java b/core/src/main/java/google/registry/beam/spec11/ThreatMatch.java
index c509a8a45..e88a3c3df 100644
--- a/core/src/main/java/google/registry/beam/spec11/ThreatMatch.java
+++ b/core/src/main/java/google/registry/beam/spec11/ThreatMatch.java
@@ -24,22 +24,10 @@ import org.json.JSONObject;
 public abstract class ThreatMatch implements Serializable {
 
   private static final String THREAT_TYPE_FIELD = "threatType";
-  private static final String PLATFORM_TYPE_FIELD = "platformType";
-  private static final String METADATA_FIELD = "threatEntryMetadata";
   private static final String DOMAIN_NAME_FIELD = "fullyQualifiedDomainName";
 
   /** Returns what kind of threat it is (malware, phishing etc.) */
   public abstract String threatType();
-  /** Returns what platforms it affects (Windows, Linux etc.) */
-  abstract String platformType();
-  /**
-   * Returns a String representing a JSON Object containing arbitrary metadata associated with this
-   * threat, or "NONE" if there is no metadata to retrieve.
-   *
-   * <p>This ideally would be a {@link JSONObject} type, but can't be due to serialization
-   * requirements.
-   */
-  abstract String metadata();
   /** Returns the fully qualified domain name [SLD].[TLD] of the matched threat. */
   public abstract String fullyQualifiedDomainName();
 
@@ -52,29 +40,19 @@ public abstract class ThreatMatch implements Serializable {
   static ThreatMatch create(JSONObject threatMatchJSON, String fullyQualifiedDomainName)
       throws JSONException {
     return new AutoValue_ThreatMatch(
-        threatMatchJSON.getString(THREAT_TYPE_FIELD),
-        threatMatchJSON.getString(PLATFORM_TYPE_FIELD),
-        threatMatchJSON.has(METADATA_FIELD)
-            ? threatMatchJSON.getJSONObject(METADATA_FIELD).toString()
-            : "NONE",
-        fullyQualifiedDomainName);
+        threatMatchJSON.getString(THREAT_TYPE_FIELD), fullyQualifiedDomainName);
   }
 
   /** Returns a {@link JSONObject} representing a subset of this object's data. */
   JSONObject toJSON() throws JSONException {
     return new JSONObject()
         .put(THREAT_TYPE_FIELD, threatType())
-        .put(PLATFORM_TYPE_FIELD, platformType())
-        .put(METADATA_FIELD, metadata())
         .put(DOMAIN_NAME_FIELD, fullyQualifiedDomainName());
   }
 
   /** Parses a {@link JSONObject} and returns an equivalent {@link ThreatMatch}. */
   public static ThreatMatch fromJSON(JSONObject threatMatch) throws JSONException {
     return new AutoValue_ThreatMatch(
-        threatMatch.getString(THREAT_TYPE_FIELD),
-        threatMatch.getString(PLATFORM_TYPE_FIELD),
-        threatMatch.getString(METADATA_FIELD),
-        threatMatch.getString(DOMAIN_NAME_FIELD));
+        threatMatch.getString(THREAT_TYPE_FIELD), threatMatch.getString(DOMAIN_NAME_FIELD));
   }
 }
diff --git a/core/src/test/java/google/registry/beam/spec11/Spec11PipelineTest.java b/core/src/test/java/google/registry/beam/spec11/Spec11PipelineTest.java
index 6bc25fef0..5e27cef67 100644
--- a/core/src/test/java/google/registry/beam/spec11/Spec11PipelineTest.java
+++ b/core/src/test/java/google/registry/beam/spec11/Spec11PipelineTest.java
@@ -195,14 +195,10 @@ public class Spec11PipelineTest {
             new JSONObject()
                 .put("fullyQualifiedDomainName", "111.com")
                 .put("threatType", "MALWARE")
-                .put("threatEntryMetadata", "NONE")
-                .put("platformType", "WINDOWS")
                 .toString(),
             new JSONObject()
                 .put("fullyQualifiedDomainName", "222.com")
                 .put("threatType", "MALWARE")
-                .put("threatEntryMetadata", "NONE")
-                .put("platformType", "WINDOWS")
                 .toString());
   }
 
diff --git a/core/src/test/java/google/registry/reporting/spec11/Spec11RegistrarThreatMatchesParserTest.java b/core/src/test/java/google/registry/reporting/spec11/Spec11RegistrarThreatMatchesParserTest.java
index 4849f4d69..2b40195d7 100644
--- a/core/src/test/java/google/registry/reporting/spec11/Spec11RegistrarThreatMatchesParserTest.java
+++ b/core/src/test/java/google/registry/reporting/spec11/Spec11RegistrarThreatMatchesParserTest.java
@@ -77,6 +77,26 @@ public class Spec11RegistrarThreatMatchesParserTest {
         .hasValue(LocalDate.parse("2018-07-14"));
   }
 
+  @Test
+  public void testSuccess_ignoreExtraFields() throws Exception {
+    ThreatMatch objectWithExtraFields =
+        ThreatMatch.fromJSON(
+            new JSONObject(
+                ImmutableMap.of(
+                    "threatType", "MALWARE",
+                    "platformType", "ANY_PLATFORM",
+                    "threatEntryMetaData", "NONE",
+                    "fullyQualifiedDomainName", "c.com")));
+    ThreatMatch objectWithoutExtraFields =
+        ThreatMatch.fromJSON(
+            new JSONObject(
+                ImmutableMap.of(
+                    "threatType", "MALWARE",
+                    "fullyQualifiedDomainName", "c.com")));
+
+    assertThat(objectWithExtraFields).isEqualTo(objectWithoutExtraFields);
+  }
+
   /** The expected contents of the sample spec11 report file */
   static ImmutableSet<RegistrarThreatMatches> sampleThreatMatches() throws Exception {
     return ImmutableSet.of(getMatchA(), getMatchB());
@@ -90,8 +110,6 @@ public class Spec11RegistrarThreatMatchesParserTest {
                 new JSONObject(
                     ImmutableMap.of(
                         "threatType", "MALWARE",
-                        "platformType", "ANY_PLATFORM",
-                        "threatEntryMetadata", "NONE",
                         "fullyQualifiedDomainName", "a.com")))));
   }
 
@@ -103,15 +121,11 @@ public class Spec11RegistrarThreatMatchesParserTest {
                 new JSONObject(
                     ImmutableMap.of(
                         "threatType", "MALWARE",
-                        "platformType", "ANY_PLATFORM",
-                        "threatEntryMetadata", "NONE",
                         "fullyQualifiedDomainName", "b.com"))),
             ThreatMatch.fromJSON(
                 new JSONObject(
                     ImmutableMap.of(
                         "threatType", "MALWARE",
-                        "platformType", "ANY_PLATFORM",
-                        "threatEntryMetadata", "NONE",
                         "fullyQualifiedDomainName", "c.com")))));
   }
 
diff --git a/core/src/test/resources/google/registry/reporting/spec11/spec11_fake_report b/core/src/test/resources/google/registry/reporting/spec11/spec11_fake_report
index d08c14455..155b7bbc9 100644
--- a/core/src/test/resources/google/registry/reporting/spec11/spec11_fake_report
+++ b/core/src/test/resources/google/registry/reporting/spec11/spec11_fake_report
@@ -1,3 +1,3 @@
 Map from registrar email / name to detected subdomain threats:
-{"threatMatches":[{"threatEntryMetadata":"NONE","threatType":"MALWARE","fullyQualifiedDomainName":"a.com","platformType":"ANY_PLATFORM"}],"registrarClientId":"TheRegistrar","registrarEmailAddress":"the.registrar@example.com"}
-{"threatMatches":[{"threatEntryMetadata":"NONE","threatType":"MALWARE","fullyQualifiedDomainName":"b.com","platformType":"ANY_PLATFORM"},{"threatEntryMetadata":"NONE","threatType":"MALWARE","fullyQualifiedDomainName":"c.com","platformType":"ANY_PLATFORM"}],"registrarClientId":"NewRegistrar","registrarEmailAddress":"new.registrar@example.com"}
+{"threatMatches":[{"threatType":"MALWARE","fullyQualifiedDomainName":"a.com"}],"registrarClientId":"TheRegistrar","registrarEmailAddress":"the.registrar@example.com"}
+{"threatMatches":[{"threatType":"MALWARE","fullyQualifiedDomainName":"b.com"},{"threatType":"MALWARE","fullyQualifiedDomainName":"c.com"}],"registrarClientId":"NewRegistrar","registrarEmailAddress":"new.registrar@example.com"}