PDF malware analysis — malicious · a9c11fb6d3d9d7e0

MALICIOUS

PDF

3.8 KB

MD5: 22f5ba8c891e08c32f1ed4890c06a600 SHA-1: 66ff92dbc39eab2767978dab3ef361aece1a8214 SHA-256: a9c11fb6d3d9d7e003b8b3c0dc84428455f0ad076310ab4079abb99a69226259

142 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it contains an exploit. Heuristics confirm the presence of embedded JavaScript, which is obfuscated using ASCIIHexDecode and ASCII85Decode filters. The JavaScript action is likely designed to download and execute a second-stage payload, a common technique for PDF-based malware delivery.

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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