PDF malware analysis — malicious · fa6ff8f3f5e38209

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: de6d32a68807c95498e57eb5f10de0d9 SHA-1: 93817edc25385c54f18df54b961f69508cd5c2ff SHA-256: fa6ff8f3f5e3820936bd9e849fcf3957ceb3a6961c88357c162440b68ea9874b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by multiple engines, including a critical ClamAV detection for Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript, which is a common technique for delivering second-stage malware. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be the execution of this embedded JavaScript, likely to download and run further malicious code.

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` `ceb595745ca39b6b4633664c539ea8fec75c7680fc018e6c5e422cbe8c74bcd3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74333 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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