PDF malware analysis — malicious · a147856b5f972f6a

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: ea65ffbf9cf298396a98194058072d95 SHA-1: 46372431ca4953a3ef64b19e9374d35f17f92452 SHA-256: a147856b5f972f6a03266acb61649907cf971c9b6b100a8ce387fb8d40bfc106

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection identifying it as Win.Trojan.Agent-36166. Embedded JavaScript was found within the document, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. This JavaScript is likely responsible for executing the malicious payload. The ML classifier also provided a very high confidence score for maliciousness.

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` `2dcfb1628b4b6fb5fd827aed86cbbabe2aeea678b439d05dbf66446ef02cd15d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75027 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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