PDF malware analysis — malicious · 2f735ba53f369c84

MALICIOUS

PDF

4.6 KB Authoring application: Biqifajiziuexo (via Giivwijsotaue)

MD5: df8dc52f75e89a264840ca8d93aacd73 SHA-1: 0baefd20c532305e11bb4edd126e61a2ca168a66 SHA-256: 2f735ba53f369c84f1aa317e9d0a71c61675de710243e165710a3207ad8c6dfd

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics as a stager. The 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic indicates that the JavaScript is obfuscated and designed to execute arbitrary code. The ML classifier strongly supports a malicious verdict. The primary attack pattern involves leveraging the PDF's JavaScript engine to download and execute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
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` `12770ed99f4f41e13837100054b65f0c0092bb1e7e2dfca331edf0b978cff6a6`	pdf-javascript-stream	PDF /JS object 11 at offset 0xCCC	842 bytes

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