PDF malware analysis — malicious · 66c6ad44afea11e5

MALICIOUS

PDF

7.3 KB Authoring application: Bofatezozinefaxfa (via 88251Vogewojixariuawi)

MD5: 5ee69b094b5c402a2e3c736123a6dfcd SHA-1: b1aa2bc5cb3bedbd4ba36606177fe48d75498c9e SHA-256: 66c6ad44afea11e5499a8aca489cdb491501a923d73eda3977a0de6048ad92f9

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by multiple heuristics and ClamAV. The JavaScript code appears to be obfuscated but is designed to download and execute a secondary payload. The ML classifier strongly indicates maliciousness. Given the nature of the embedded script and the PDF format, it is highly likely this document was delivered as a spearphishing attachment.

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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