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medium
CORPUS_RARE_STRUCTURAL_FEATURE_SET
What it means
Normalized parser/payload feature set is rare and has appeared on a flagged file before.
Why it fires
This corpus signal groups exact rule IDs into broader structural features such as font-parser anomalies, object-graph divergence, embedded payloads, and shellcode evidence. It can surface recurring exploit shapes even when the precise signature names differ.
Other General heuristics
POLYGLOT_PDF_APPENDED_ZIP_CVE_BUNDLE EXTRACTED_FILE_CLAMAV POLYGLOT_GIF_PDF_FORCEDENTRY_SHAPE SPEC_DIVERGENCE_HIGH PDF_EXTENSION_MISMATCH POLYGLOT_PDF_ZIP_APPENDED EXTRACTED_FILE_STATIC_TRIAGE CORPUS_HISTORICALLY_MALICIOUS POLYGLOT_TEXT_PDF POLYGLOT_ZIP_PREFIXED FORMAT_NEUTRAL_SCAN PPT_FOPT_COMPLEX_DATA_OVERFLOW PPT_FOPT_PROPERTY_TABLE_TRUNCATED CORPUS_RARE_COMBINATION ANALYSIS_TIMEOUT_PARTIAL EMBEDDED_URL MACRO_VALID_PUBLISHER_SIGNATURE SCAN_OPTIONAL_STAGES_SKIPPED POLYGLOT_PDF_APPENDED_ZIP_SCAN_INCOMPLETE SCAN_INCOMPLETE UNKNOWN_FORMAT