PDF malware analysis — malicious · 11dc50b4db36e9d5

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: fa4df657abf20255ffb680a4bc126925 SHA-1: 303b13fbcd28d658c8381fcc36d3f02224789570 SHA-256: 11dc50b4db36e9d55aa42c69f1e00933ac8742e3981aa28e642c35b38eece67b

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV also detected it as Win.Trojan.Agent-36166. The JavaScript appears to be obfuscated but is likely responsible for downloading and executing a second-stage payload, a common technique for this type of threat. The presence of JavaScript and the malicious detection strongly indicate an exploit targeting PDF vulnerabilities for initial execution.

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` `c40f64f6a2c90407b7b4f65bb7d92efe019a62e6b90eef0bcdc20ae04567dcef`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74356 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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