PDF malware analysis — malicious · 67d1b8f9caf2df76

MALICIOUS

PDF

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

MD5: 0f8b00c1f003535e7c690877eb55ae91 SHA-1: 0473d2bc21356a97c9a4505693521e83a0a628a1 SHA-256: 67d1b8f9caf2df76ba4ac94aec2c4e58c462c95fe2c27ea6e8fa6324bfe6dee9

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. Embedded JavaScript was detected, indicating an attempt to execute code. The obfuscated JavaScript likely aims to download and run a second-stage payload, exploiting a client execution vulnerability. Given the nature of the file and the detection name, it is highly probable that this is a malicious document delivered as an attachment.

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` `7b86f329def014893124c8785c87b12a2fc0f48dfdfef94335e3d908ecf6e366`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75917 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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