PDF malware analysis — malicious · 67c08593c7975c1b

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: 062c3073bd97128c1d87d9d0c7e35b50 SHA-1: c35be729c3de5e0536f7d6876fa527e673205dfc SHA-256: 67c08593c7975c1b0fd0f46400604e2686cdc26d9565c77fd7d344280576fd52

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, identified by multiple heuristics and a critical ClamAV detection as Win.Trojan.Agent-36166. The JavaScript is heavily obfuscated but its presence and the ClamAV detection strongly indicate that the PDF is designed to download and execute a secondary malicious payload. The ML classifier also flagged this PDF with a very high probability of being malicious.

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` `11dfc1892f73c3e7410ea3275deddadf0a92a39e99687609decee42e90effa41`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74634 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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