PDF malware analysis — malicious · fe4d4f5ff73e7316

MALICIOUS

PDF

3.9 KB

MD5: bba453479a7d8cb6f12bb776697a3598 SHA-1: 2b9d56397ad95be1027829f0b37b86de5b8ce21a SHA-256: fe4d4f5ff73e7316bdbef511a347ffec429d1e98f9b6de2d7252efb6950c636b

142 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of PDF-specific filters like ASCIIHexDecode and ASCII85Decode, combined with JavaScript actions and embedded JS streams, suggests an exploit attempt. The ML model's high confidence score further supports this. The file was detected as Pdf.Exploit.Agent-36178 by ClamAV.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-36178 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36178
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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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