PDF malware analysis — malicious · 654391a18b71556e

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: 69ee83fb32d836a58f048a31cd40413e SHA-1: 33956863adb62b601f0607f5c5ea30c9f508c4bf SHA-256: 654391a18b71556e5740ded338600e993fcc6f7b12132fed52d076d42f02de8c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, which identified it as 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, indicated by heuristic firings and the extracted script, suggests an attempt to exploit a client execution vulnerability. The script itself is heavily obfuscated, but its structure and the heuristic firings point towards it 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` `cd3cc2014adedce9da9f82ff659430ce1f567fadc004c266eb7e5861e8958e03`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74349 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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