PDF malware analysis — malicious · 36d4bb4c4321f8c2

MALICIOUS

PDF

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

MD5: 3120e16b337687c8ca6781713ecf96e6 SHA-1: 51e12f339956d4873dca29b094d1c0d8de207116 SHA-256: 36d4bb4c4321f8c2feb12c3392a4440d5e74ef8a89b0299b9451acbf1f4f0663

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristic analysis and a machine learning classifier strongly indicate malicious intent. ClamAV detection confirms this, identifying the file as 'Win.Trojan.Agent-36166'. 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` `486fd524c1086a6b468e4e2b461472c247aa6c0fdaa822fc93c50e647bf7f23c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	84787 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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