PDF malware analysis — malicious · ae92ac53edcb60a1

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: de8e9e2b40e3331687b75e1ec3cc347f SHA-1: 5c2c89cee8a695f57bec4811b0902ce8dc6c1bc4 SHA-256: ae92ac53edcb60a181e3bf24650d8f357e951add41fbd214057be5c218ae69fe

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains embedded JavaScript, which is a common technique for delivering malware. The ClamAV detection 'Win.Trojan.Agent-36166' strongly suggests a known trojan agent. The JavaScript's likely purpose is to download and execute a second-stage payload, contributing to the overall malicious intent of the PDF.

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` `412b0f4b8b76f8c824f2520a1e8d390482c82399599a9e4c6cbc02f24788a795`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75121 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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