PDF malware analysis — malicious · 5f86daa5eca48a05

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: 52e1470b509ef4550c9770530f1fd336 SHA-1: dd3f00f3b5eb7e12620af77199444a53930409e1 SHA-256: 5f86daa5eca48a05c9e39318ee98e224963d35bc932bbee5bbefaaebb76005d0

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166', and an ML classifier indicating high maliciousness. Embedded JavaScript was extracted, which is likely responsible for downloading and executing a secondary payload. The presence of JavaScript actions and streams within the PDF strongly suggests an attempt to exploit the user via a malicious attachment, aligning with the 'Spearphishing Attachment' technique.

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` `983979321f5d39b66f5536e05d97fca59812f800a21501f335420e6fb9cbb448`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74698 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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