PDF malware analysis — malicious · f9240fc8b38e8b59

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: 939ed27be5e01e980f7351bf9afb72ce SHA-1: 78f8dfb00a9d49d9d684f9eb6f583b53ea3a897e SHA-256: f9240fc8b38e8b594283b1f78a8a564e017ff0784acdf7e06258d49cea7b6773

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The file is identified as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis detected embedded JavaScript within the PDF, indicating an attempt to leverage a PDF vulnerability for code execution. The extracted JavaScript is substantial, suggesting it performs complex malicious actions, though its exact function is obscured.

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` `ffcb56ab76b0189175acce4bd3dbee68807724d212a4b798ecab4df6dc8a4164`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74662 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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