PDF malware analysis — malicious · 7000fc4a7c4e92c0

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: 11694621c392ef45eaa1fca6bb1a30c9 SHA-1: 62212831bad8a1550fdd8a9b345781b8c3fc5600 SHA-256: 7000fc4a7c4e92c0b99df7bb97fe029a5a4ba21bf3e83ed1f292dad35026f08e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection identifying it as 'Win.Trojan.Agent-36166'. Embedded JavaScript was found, which is commonly used to download and execute further malicious content. The presence of JavaScript actions and embedded JS streams strongly suggests this technique. Given the nature of PDF files being delivered via email, Spearphishing Attachment is a likely initial access vector.

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` `794b4075defe74fe6e76ddf71053bcd4e21453ea632b21e3d7220d41f5037764`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74338 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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