PDF malware analysis — malicious · dcb8593539172f86

MALICIOUS

PDF

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

MD5: fdca86fc8f49502bb0962ab73cc7cc74 SHA-1: 19bedc331a138d4bb9555ae48ca945edcf9e1dc1 SHA-256: dcb8593539172f86157ae73fd342608e1fd2f3f7882dca7c7ee1fa25208a29a8

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection (Win.Trojan.Agent-36166) strongly suggest malicious intent. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, as is common with this type of attack. The extracted artifact name 'javascript_obj0007_000.js' and the ClamAV detection name are the primary IOCs.

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` `ef5d4a14dfdb25746d8bf243844cb2c4dcb1a326469c3c6693d08f7a918557f6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74806 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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