PDF malware analysis — malicious · b931a6ef3b7c2e10

MALICIOUS

PDF

3.8 KB

MD5: af350e7b773686c9fe097c7e1e82eda9 SHA-1: e91b4dcdf2d60c3a353fb9db335bc1e2d87a93b0 SHA-256: b931a6ef3b7c2e106cd340b58a8c5dcba2d14f7135782d5cf39ef3e7143c7e7f

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and a machine learning classifier. Heuristics indicate the presence of JavaScript and the use of ASCIIHexDecode and ASCII85Decode filters, commonly used to obfuscate exploit code within PDFs. The ML classifier's high confidence score further supports the malicious nature of the file.

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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