PDF malware analysis — malicious · 03f9920f4572eee2

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: fc3073f51ec1f398f1de7d836e1eb205 SHA-1: 9844e1f9705520918c2e6d0f3a9d25bcb44367a4 SHA-256: 03f9920f4572eee25fc94efbcf7d2f1d61081ff1a05e78d73ae9dfbae54d6593

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 an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript, identified by multiple heuristics, suggests an attempt to exploit vulnerabilities and execute arbitrary code. The JavaScript code itself is heavily obfuscated, but its structure implies it is designed to download and execute a secondary payload, consistent with the 'Win.Trojan.Agent-36166' detection.

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` `b48bc85e829cf6d8f3372ed7be216c119ea2c30993d15cbb798631121a4d3f74`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75110 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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