PDF malware analysis — malicious · 4290f9fe6abdb559

MALICIOUS

PDF

3.8 KB

MD5: bdbf5146d7b58b1d5dd786f2d45ebe81 SHA-1: f4440f99f2ed871d71859e8e1b8014125b6d22e9 SHA-256: 4290f9fe6abdb559c96b868a1e4d6c2178cbd161ffdafbfe3ddedbd2e2ad4a4d

142 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV and a machine learning classifier, indicating it's a known PDF exploit. Heuristics indicate the presence of embedded JavaScript and the use of decoding filters like ASCIIHexDecode and ASCII85Decode, commonly used to obfuscate malicious content within PDFs. The ML classifier's high confidence score further supports this assessment.

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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