PDF malware analysis — malicious · 71ab5c6a1e2bfaf9

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: 8a81c5723afece58840fe3b1eae73547 SHA-1: 563b57ed9ceea492d441c9e6703eff759ef71b77 SHA-256: 71ab5c6a1e2bfaf9ed99b1ea4d6f5860a95504be136969b7ac170752904248d1

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Win.Trojan.Agent-36166. The embedded JavaScript, although heavily obfuscated, indicates an attempt to execute code and likely download a secondary payload, aligning with exploitation techniques. The presence of JavaScript actions and embedded JS streams points to T1059.007. Given it's a PDF, T1566.001 is a likely initial access vector.

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` `0f747c38916a13413b9a6631039944e9c0b13bbbb35607e89497a16f67554b66`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75144 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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