PDF malware analysis — malicious · 9354a658a1c28410

MALICIOUS

PDF

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

MD5: f952db4b92fd77ee95ff5ab3782a7a13 SHA-1: f40a0b1cb93b02711ff032ba024b6e987853a23d SHA-256: 9354a658a1c28410571dfbde8aa3683df108f66bf65f45f71e9c3ae155a0eb8a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

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. ClamAV identified the file as Win.Trojan.Agent-36166, which is a known Trojan agent. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

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` `b80b28b13bc1572a1a639d8f5cced605450f0575a5f7d45a8a675576e5806c1d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74718 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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