PDF malware analysis — malicious · 63e247da7793a8c9

MALICIOUS

PDF

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

MD5: 1b61feecf8c925528e4ea5cf603824f1 SHA-1: a8f5e5e78f0790311a2a25446fced1fb363d5376 SHA-256: 63e247da7793a8c9b3df9f8782e4e7a0e6f36b9232d33e69e8b8f503c6c6cf99

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 multiple engines, including ClamAV which identified it as 'Win.Trojan.Agent-36166'. Static analysis revealed embedded JavaScript, indicating an attempt to exploit vulnerabilities within the PDF reader. The JavaScript code, though obfuscated, appears to be designed to download and execute a secondary payload, a common technique for malware distribution.

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` `d949cc8a48f380c9eb08d52811eed1443689ca6dbbdc9263a7dbf210f3d6e608`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	76124 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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