PDF malware analysis — malicious · 53ce4e5463d153fa

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via c64b8Ylojoppekaxopqi)

MD5: fb09294ebb80f35c7b260dda626cc2f4 SHA-1: acf133fc4f13bd79c56b8a8c4b05e3226dea2784 SHA-256: 53ce4e5463d153fa3d30b2285cccfde27cf7a7f14a1ecebb7a3a67268be0aba1

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 for executing code. The ML classifier strongly indicates maliciousness. The JavaScript's purpose appears to be downloading and executing a second-stage payload, as suggested by the 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic. The document body is heavily obfuscated and unreadable, providing no direct clues to the lure.

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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