PDF malware analysis — malicious · 6fc33a21b2a78fe6

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: 902b86539368e22129d565a3f24cfefd SHA-1: 2d1a59239bd39da4b41b4e4e4b7394fe72aede60 SHA-256: 6fc33a21b2a78fe675e4d65be8066e458e8ed206a07cc1709f947b97e9241643

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV detection confirms this, identifying it as 'Win.Trojan.Agent-36166'. The JavaScript appears to be heavily obfuscated, but its presence and the ML/heuristic flags strongly suggest it's designed to download and execute a secondary payload, aligning with common malware delivery techniques.

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` `2ab2fbd6746529bf16b9de2348dc36a2553cf5e2757407d8d64b1eef1f25f6e7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74316 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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