PDF malware analysis — malicious · 72d5f52d7ae3209e

MALICIOUS

PDF

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

MD5: 57e8006035baa013a8e5ca0db688b042 SHA-1: 824e7cde7f5f6572055adfb32194837eb39ef59f SHA-256: 72d5f52d7ae3209e42d03910345ce111875e8968cd30681f8aef496413ef987c

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 execute arbitrary code. The JavaScript code, though obfuscated, appears to be designed to download and execute a second-stage payload, as indicated by the string concatenation and the overall structure of the script. The ClamAV detection name 'Win.Trojan.Agent-36166' is included as a primary IOC.

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` `de8c0a2a9bd5a3b0e08dac25e1f8ddd4dcbe6b2ac5788304bb75913df41b1951`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74927 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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