PDF malware analysis — malicious · 3d21ad173ed0962d

MALICIOUS

PDF

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

MD5: ddf7a215e194a91da972a795d7ec6bf8 SHA-1: 10dd4d30cce95387e5d27b7ca9a02968e1bb9545 SHA-256: 3d21ad173ed0962dd983e8b1b7d0c345cd04c9b3bee593323b0d7f4a21ddc249

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. Specifically, the presence of embedded JavaScript (PDF_JAVASCRIPT, PDF_JS) suggests an attempt to execute code. The ClamAV detection of 'Win.Trojan.Agent-36166' further supports the malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for this type of threat.

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` `aa509215711256ef4e7d28841e7342b86069551e5cff109867097bd65db4583f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74613 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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