PDF malware analysis — malicious · 72b6940d0e837e40

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: 67c990e93afeb6562c55fd61a2bed0a5 SHA-1: bb7491fa3893d37138e186a92be2963eee6b6db0 SHA-256: 72b6940d0e837e408bbfd350171cba96c365207482aa34ebf03178b88635d94f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript, indicated by heuristic firings and the presence of a javascript_obj0007_000.js file. ClamAV detection confirms this is a malicious agent, likely a trojan. The JavaScript is heavily obfuscated, but its presence and the ML classifier's high confidence 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` `6b0e654b0cbaae3f549253069f996414669f284d0aa121933cdc1bd6910d57d3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74565 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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