PDF malware analysis — malicious · 0c99d9608d3d7f66

MALICIOUS

PDF

14.9 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)

MD5: d45e7ef500930abb9cd7d54fe3a999d5 SHA-1: c8f44510839cc0ef039fbea370fc1bbb5ba0dd89 SHA-256: 0c99d9608d3d7f66e2b4e0f0ae38b8f76fa22c7d04d263337ae96133c219b162

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV identifies it as Win.Trojan.Agent-36166. The embedded JavaScript is heavily obfuscated but appears to be designed to execute an exploit, likely leading to the download and execution of a further stage. The presence of JavaScript actions and embedded JS streams strongly suggests exploitation for client 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` `dbc844736ee76a478b945dd9ea46abdba9b9d452725228d41758565e905a6691`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	83610 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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