PDF malware analysis — malicious · 0ab4834f591d467d

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: 66ea0c3049df09f506119bf9d07a3697 SHA-1: 11f19d31aeec08590c97d6054d4ba25ee03a3c72 SHA-256: 0ab4834f591d467da2257e7188cf61a3da38d3f2ff0b0644f93cb9ef314d04df

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV, specifically identified as Win.Trojan.Agent-36166. It contains embedded JavaScript which is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams strongly suggests exploitation for client execution, likely delivered via spearphishing.

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` `9e1dd594f1592f69abc7d62c2ee462416cce5f74879e0dac8963bb04b2bb8f39`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74604 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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