PDF malware analysis — malicious · 3e24ab7c2bf4dc5b

MALICIOUS

PDF

6.3 KB Authoring application: Woibneqeni (via 1225fUzenwzijecijawida)

MD5: b335ce5e051f86816e1210946575147a SHA-1: 3f21094e506bd71d07df202ee7f2dcfe0e125748 SHA-256: 3e24ab7c2bf4dc5b9ff8e61099d5d11316dec179c7fe9d7ff11b7109c9c588a5

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics as a stager. The ML classifier strongly indicates maliciousness. The JavaScript stream, named 'javascript_obj0010_000.js', is likely responsible for downloading and executing a secondary payload, which is a common technique for initial access and further system compromise.

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_obj0010_000.js` `e5fb7241b86520d30618ed164f0373984e043b354e933bd4bfa81c848e06fafc`	pdf-javascript-stream	PDF /JS object 10 at offset 0x11B0	1464 bytes

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