PDF malware analysis — malicious · 5b3d25a612f1c46a

MALICIOUS

PDF

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

MD5: dcb0d300b170160386bf6b1f37c983b2 SHA-1: 4f6280b4b9c7e992e4e10736b4019f589e5f7437 SHA-256: 5b3d25a612f1c46a2f7461f05c66bc699fccfb9151f1f9644eac3fd9149af7e5

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Win.Trojan.Agent-36166'. Embedded JavaScript was detected, which is commonly used in PDFs to exploit vulnerabilities and download further malicious content. The presence of JavaScript and the ML classification strongly suggest an attempt to execute arbitrary code, likely as a spearphishing attachment.

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` `0e78cb0799b2b673383c22d20e79a69b09bdc97c740aa5897e258a61120041c4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	76172 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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