PDF malware analysis — malicious · cb8f6478beff5439

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: db2077df351418baa1cc9d4af7f99d08 SHA-1: b355377679261572b74826b3bb643ad3e1ceb3fc SHA-256: cb8f6478beff54394d4f8133a119f1347dab686f24589de0153434ffe73f800e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, identifying it as malicious. The presence of embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS firings, suggests an attempt to execute code. ClamAV detection of 'Win.Trojan.Agent-36166' further confirms its malicious nature and provides a specific signature for tracking.

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` `af6a747baa989d7b9c52c83e9754e7f7082db53e10fa2214599448871e16cbd9`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74401 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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