PDF malware analysis — malicious · f05960a2b28e3533

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: fe218b159029d828de4a001ca5ed7846 SHA-1: a79d2525eadecf7da56bfc6d313c06da1abfbe27 SHA-256: f05960a2b28e35330fa6b56a53e7b315e41609030adbae97ac10aaa016b63f55

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by multiple engines, including a high-confidence ML classifier and ClamAV, which identified it as Win.Trojan.Agent-36166. The presence of embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics, strongly suggests that the document is designed to execute malicious code. This script is likely responsible for downloading and executing a second-stage payload, aligning with the identified ClamAV signature.

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` `6419754f28675fd784756693ad3ab3e7695e35e34dd121054fde8a5286c99a2f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74941 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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