PDF malware analysis — malicious · 4161bb20d5dfb345

MALICIOUS

PDF

5.2 KB First seen: 2021-10-31

MD5: be6e0e6d6d7893efe118b15c2c47d5a5 SHA-1: 6c28991c402632bc445b5941f90d40e7adbe2c34 SHA-256: 4161bb20d5dfb345f7e7f2c38a8b097fe20413c67979a0cfa7d9e76f36ae72f8

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_OBFUSCATED_NAME_OBJECT'. The ML classifier and ClamAV also flagged this as malicious. The embedded JavaScript is likely designed to exploit a vulnerability and download a second-stage payload, a common technique for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 4

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT

A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
JavaScript action low 1 related finding 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.

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