PDF malware analysis — malicious · 68b404d9292ab2b0

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via 7de25Ylojoppekaxopqi)

MD5: 13fbbee08eb116e32b640bc20d606a72 SHA-1: 8a3227f093473fc4c8f5fea1d31f7692bdba2acc SHA-256: 68b404d9292ab2b08267c7cfe78bb9ce81f24807e4989c6db2e7425a655dbe12

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is obfuscated and designed to be evaluated. The heuristics indicate this script acts as a stager, likely downloading and executing a second-stage payload. The ML classifier strongly suggests malicious intent. Given the nature of PDF-based malware, it is highly probable this file was delivered as a spearphishing attachment.

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_obj0008_000.js` `c510f8c6a5031d17c6606a6a4e88ede1c3452bf51c2d06efb7ba03d3692fec56`	pdf-javascript-stream	PDF /JS object 8 at offset 0xF52	1346 bytes

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