PDF malware analysis — malicious · cbf26f8e2ea22d17

MALICIOUS

PDF

14.3 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)

MD5: 6e68b2fd7c97730f3fecd306e86aa77f SHA-1: 6874342c341660003715a3b3cf4bb001b5d48ce1 SHA-256: cbf26f8e2ea22d170d015c1d89623351f565c19b488b6baeccdc73999740d4fa

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by ClamAV as Win.Trojan.Agent-36166. It also contains embedded JavaScript, which is a common technique for delivering malicious payloads. The JavaScript is likely responsible for downloading and executing a second-stage payload, although its exact function is obscured by obfuscation. The presence of JavaScript actions and embedded JS streams points to a malicious intent.

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` `b0353ab5c42883fd6e7f7f49d8c2aac2afa6d411adfd7b146ba29e764be19c9d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74371 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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