PDF malware analysis — malicious · 6bd9052018c39ff8

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: ffd0f0c445cfb3d595fcd439ff8f9ed9 SHA-1: ce75410ffd70e1e5353fb8be61c12238cae2df83 SHA-256: 6bd9052018c39ff8d2ff46a444d95948448cbf221db5718bac7ff30bad6ea108

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. It contains embedded JavaScript which is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams points to exploitation of client execution vulnerabilities within the PDF reader.

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` `897b13b9b20de020cd906372dbe1a4e617bfc08d0e3dbe2a5e4b5dcb447e9914`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75131 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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