PDF malware analysis — malicious · c8dc5d6d1a5df6de

MALICIOUS

PDF

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

MD5: 08ec372c585d135bfa8e44894f2ac7ef SHA-1: 74f0378b666b086d27a72d148bd1da35ab613c2c SHA-256: c8dc5d6d1a5df6de0184ee3890e4cf321c37d0fc98a66d73c99096b67c19e86c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as Win.Trojan.Agent-36166. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as is common with this type of attack. The presence of JavaScript actions and streams points to its use in delivering the malicious 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` `b6067191fa71b538ae9f53c0c600db0b26d1350c6d4eec97516c106ce0fb6d36`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	83644 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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