adding blacklist for common false-positives

Author: nklapste

src/main/java/jadx/plugins/stringdecoder/B64Detector.java

@@ -21,6 +21,9 @@ private B64Detector() {
 	 * All detection thresholds are taken from {@code options}.
 	 */
 	public static String detect(String str, B64DeobfuscateOptions options) {
+		if (B64FalsePositives.contains(str)) {
+			return null;
+		}
 		if (str.length() < options.getMinInputLength()) {
 			return null;
 		}

src/main/java/jadx/plugins/stringdecoder/B64FalsePositives.java

@@ -0,0 +1,22 @@
+package jadx.plugins.stringdecoder;
+
+import java.util.Set;
+
+/**
+ * Known Base64-charset strings that decode to something plausible but are not intentional
+ * Base64 encoding — common identifiers, framework tokens, etc. that slip past the
+ * statistical filters. Add entries here when a repeating false positive is confirmed.
+ */
+final class B64FalsePositives {
+
+	private static final Set<String> ENTRIES = Set.of(
+			"SystemJobScheduler" // Android class name; decodes to mostly-printable garbage that passes ratio checks
+	);
+
+	static boolean contains(String str) {
+		return ENTRIES.contains(str);
+	}
+
+	private B64FalsePositives() {
+	}
+}

src/test/java/jadx/plugins/stringdecoder/JadxStringDecoderPluginTest.java

@@ -259,6 +259,14 @@ public void filledArrayB64Test() throws Exception {
 		assertThat(code).contains("b64[4]: testing");
 	}
 
+	@Test
+	public void falsePositiveSystemJobSchedulerTest() throws Exception {
+		// "SystemJobScheduler" is a known Android class name that slips past ratio filters
+		String code = decompileSmali("b64/false_positive_system_job_scheduler.smali");
+		System.out.println(code);
+		assertThat(code).doesNotContain("b64:");
+	}
+
 	@Test
 	public void byteArrayStringPassDisabledTest() throws Exception {
 		// with enableByteArrayStringPass=false the bytes: comment must not appear