PDF malware analysis — malicious · cb43bf34a6c20f55

MALICIOUS

PDF

7.8 KB Created: 2010-09-21 20:42:51 Authoring application: Doxifajahigjobe (via 00439Tomawaliuepizi)

MD5: 244b3424bc76a6c02ec30f87d0bc42b0 SHA-1: 6a8a72f2f0c8b531fde73bcb52efab640a7a0f4a SHA-256: cb43bf34a6c20f5585947b3f63bffacef3000d3432fe6620f4bf952c69b9daf4

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for obfuscated objects and a high ML score, indicating malicious intent. The presence of embedded JavaScript, identified by PDF_JAVASCRIPT and PDF_JS heuristics, suggests an attempt to execute arbitrary code. While the document body is unreadable, the JavaScript is the primary indicator of malicious activity, likely serving as a dropper or downloader for further stages.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

Heuristics 3

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0011_000.js` `9106999da8553f6c6b05a4ae46a0e61bbc3c0afca5556084b61a1c3623a2a08e`	pdf-javascript-stream	PDF /JS object 11 at offset 0x133F	3122 bytes

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