PDF malware analysis — malicious · 7a1bf6a38ac12529

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: 7ee92e0a3208a642c722eb6de17216e4 SHA-1: 93551c92656e51edf98fe18c3eb05c7f014140ed SHA-256: 7a1bf6a38ac12529b17970c0b0f0eb9737c15f15886d86e632e29ee387595ad0

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier. ClamAV detections indicate it's a dropper for a malicious agent. The JavaScript is heavily obfuscated but appears to be responsible for downloading and executing a secondary payload, a common technique for malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7275255-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7275255-0
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` `4d0a4d28e3bbde8033645a6b16ff3d5b84d6a2fd5edc379f313775486d5ec858`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75084 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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