PDF malware analysis — malicious · 6f9343d1df04c9ea

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: c03ee1457cb2693c0d4ebf93aa91e1b5 SHA-1: a00101719ce7a50ac4c7e98f8dcdb2b442011093 SHA-256: 6f9343d1df04c9eaf70d28dfa7f9522feea61633a115fd4a347855051f6e14ff

166 Risk Score

Malware Insights

MITRE ATT&CK

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

This 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 heuristic firings and the extracted script, suggests an attempt to exploit a client-side vulnerability for execution. The script itself is heavily obfuscated but appears to be designed to download and execute a secondary 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` `6a612dc95d0c89a156b040d3cff570668007160b7dcb60dd4e27d724d3c25745`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75145 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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