PDF malware analysis — malicious · 0d987e9daff7443d

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)

MD5: a542b2a8f1f4b8e2aaa3b97b8985c441 SHA-1: 3f393df32e4b974d909a32d748a763c4046921ce SHA-256: 0d987e9daff7443d53e50173960099033a354e902ad64ee96b1b75be9266589c

166 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, which identified it as 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, indicated by multiple heuristics and the 'pdf-javascript-stream' artifact, strongly suggests an attempt to exploit a client execution vulnerability. The JavaScript code, though partially obfuscated, appears designed to download and execute a secondary payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36166
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `2f605d4e8aa99275be0e404a6a04a8bed39deb800fcb726b88ee4965bec22cab`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74933 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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