PDF malware analysis — malicious · 6b0ebd97a7a877b8

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: 5717fad04b06e6730342254a40bd4574 SHA-1: 7c25d9795c7e8c4c8c67dc5c4cb754d5dd0d697f SHA-256: 6b0ebd97a7a877b8951d7e6314c2c5faa2313c9f82fe2d2576fe8372e61663dd

166 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that contains embedded JavaScript, which is a common technique for exploiting vulnerabilities in PDF readers. Heuristics and ML classifiers indicate malicious intent, and ClamAV detection confirms it as Win.Trojan.Agent-36166. The embedded JavaScript is heavily obfuscated, but its presence and the PDF structure strongly suggest it's designed to download and execute 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` `cf3875cb9b9bd87f7f55b3733f019a8c99393f11aaf65dcdb19cd8729e71be74`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75177 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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