PDF malware analysis — malicious · 7771fc097d897191

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: f4f9e2664f5d824353d870509b9128aa SHA-1: 7c0659d60cbb591d2331e9bf401463367ce1660d SHA-256: 7771fc097d8971915729be98e1d83ccce1c8ba6c8ce4bc2010d08dfb447c696e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ML classifier and ClamAV detection ('Win.Trojan.Agent-36166') strongly suggest malicious intent. The embedded JavaScript is likely responsible for executing the malicious payload, as suggested by the ClamAV detection on an extracted artifact.

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` `f09e3f1c80b00fd3525d2357d49603a0f85c397d2b46bb346fd48ebb9e9bab60`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75208 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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