PDF malware analysis — malicious · 966788ce55a9d6e7

MALICIOUS

PDF

7.3 KB Authoring application: Bofatezozinefaxfa (via 58fdaVogewojixariuawi)

MD5: a63c0f9a4f5fe88b7b60a718863bf7df SHA-1: 4767f9c7ccf1d0eeff5b20df8e05a2386b56a8f9 SHA-256: 966788ce55a9d6e77c548490512f7c717762ef7ed77c360e5ed2f809851c7e24

106 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for obfuscated objects and an ML classifier indicating maliciousness. The presence of embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS firings, suggests an attempt to exploit vulnerabilities within the PDF reader to execute arbitrary code. The JavaScript likely serves to download and execute a secondary payload, a common technique for initial access.

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` `ca838ab153ea9de4fff1e74bdd0848fd720f71bc6fbee4425be234136cd19b41`	pdf-javascript-stream	PDF /JS object 11 at offset 0x1349	2325 bytes

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