PDF malware analysis — malicious · 672dbea08907f2b6

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: 0b858c4d460fa63bb98ebf88b3f4f334 SHA-1: f8cdf260b3ae144949930933a264b19bd803c826 SHA-256: 672dbea08907f2b60593aeb34feb33958c82bdc545b24bcfd958b08a00f0cb9f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript which is heavily obfuscated but appears to be designed to download and execute a second-stage payload. ClamAV detection of 'Win.Trojan.Agent-36166' further confirms the malicious nature of the file. The ML classifier also strongly indicated maliciousness.

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` `fb45cf3f6f7678f6442c8f8c37cac7c1107952b85bdfe8fc7889045d249fd8c8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74684 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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