PDF malware analysis — malicious · 6a24a67840dc8c82

MALICIOUS

PDF

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

MD5: 77a83718b31acac59a1df46b8748c673 SHA-1: 36c68139fe6cfca91d78d3397c8b521fa197a095 SHA-256: 6a24a67840dc8c82a240c18d38e93f20374dfe738e5eb3abbf75bb520fca5717

166 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The embedded JavaScript, although heavily obfuscated, is designed to download and execute a second-stage payload, consistent with the 'Win.Trojan.Agent-36166' detection. The primary attack vector is likely spearphishing, with the PDF serving as an 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` `47b214dd7eebc6f5c3c38996346596236401963994fafc770f805095493e4ab3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74796 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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