PDF malware analysis — malicious · a6a8d851a19558bb

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: 30a7854da38f0314b4111b72d87ecd1b SHA-1: 259c5d3ebbf21c66a4cf4083762348eb3d19075c SHA-256: a6a8d851a19558bb29b068de88a2ce8178cba78240d91ed6f1ff8f41888b5027

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded JavaScript stream which, based on the 'PDF_JAVASCRIPT' and 'PDF_JS' firings, is the primary mechanism for malicious activity. The ClamAV detection of 'Win.Trojan.Agent-36166' further confirms its malicious nature. The JavaScript is likely responsible for downloading and executing a second-stage payload.

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` `12e776e8befbe6af9300c3ba564a9d5700700cd8d109cf0af29a1a0211ce320c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74518 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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