PDF malware analysis — malicious · 8e03cd55deec6e69

MALICIOUS

PDF

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

MD5: eac927605a89a7f91079c42b3f63dbfb SHA-1: 05c7e13dd83cc9024f145d66aaed4ca326e89e6a SHA-256: 8e03cd55deec6e69cac48eb7c6a67e20e6e31708c3559a53736da32a99eda528

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 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, is designed to download and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams points to exploitation for client execution, likely delivered via spearphishing.

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` `eb4523e511a71daaac94bbbc49a51f6350563d5889006e6bd2fe95f2c158b731`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	84345 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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