PDF malware analysis — malicious · 99d32e96aabb9da2

MALICIOUS

PDF

27.1 KB

MD5: 5f4b01dfb2b28ed945381a8bc860b12e SHA-1: 230f1a76cc2583a88d5e60b6914313294b3b4093 SHA-256: 99d32e96aabb9da289870d6110cec735844df5190fd59526b0f1221c3079529b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_CORRELATED_MALICIOUS_JS. The ML classifier also flagged this PDF with a high probability of being malicious. The presence of ASCIIHexDecode and ASCII85Decode filters further suggests obfuscation techniques commonly used in malicious PDFs. The primary attack pattern involves leveraging these embedded scripts to execute malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

Correlated malicious PDF JavaScript signals critical PDF_CORRELATED_MALICIOUS_JS

PDF JavaScript or auto-action content is corroborated by exploit staging, ML, or suspicious extracted-artifact findings. This correlation promotes old exploit-kit PDFs that otherwise remain in the suspicious band because each individual signal is intentionally weighted conservatively.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation

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