MALICIOUS
66
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 JavaScript
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The PDF sample contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics, and uses ASCIIHexDecode filters which are often employed to obfuscate malicious content. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for initial compromise.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 3
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ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEXHex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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