PDF malware analysis — malicious · f3bcb8cdedfc106f

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: e35cfde995ff1531da382352f2f6ba1b SHA-1: 97a2ba6bb9a50ace2f0135a907cf3f6690e9d1c4 SHA-256: f3bcb8cdedfc106f87d6eca28c2174c45d780535f755fc30444fca29b0474829

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The file is a PDF document flagged as malicious by multiple engines, including ClamAV which identified it as Win.Trojan.Agent-36166. Static analysis detected embedded JavaScript, indicating an attempt to execute malicious code. The ML classifier also strongly suggests malicious intent. The primary function appears to be downloading and executing a secondary payload, typical of a trojan downloader.

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` `d2cf2594a0c47c2f97d9f00fd1cca46c444c5d7a02a6898c016485493a153e59`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74604 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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