PDF malware analysis — malicious · 0891692cda51bcb3

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: c70275a1f988099d8b66fd11a7ebc2d2 SHA-1: 46429d39324a8c45f68dba39fa42adf83acbd47c SHA-256: 0891692cda51bcb38345326c239c52c042a50dca6e4d1eb205eea2df7ea65e7c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV identifies the sample as Win.Trojan.Agent-36166, indicating it likely functions as a downloader for further malicious payloads. The JavaScript itself is heavily obfuscated, but its presence and the overall classification strongly suggest a malicious intent to execute arbitrary code.

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` `c7be917a62e26bd8d6beead7714b68a40f2c1cbede1f07ab1f35029d78f7a24d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74324 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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