PDF malware analysis — malicious · c090046ec0f576b9

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via 9fd2fYlojoppekaxopqi)

MD5: 25eda8b5d02f7b407ee1a445da30e520 SHA-1: 88e2ec1e3db0c8106d098f168e5830d8b728ac83 SHA-256: c090046ec0f576b9946651283448015f817abb333453d5db0a336b80e3dcbc7f

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. The 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic indicates that this JavaScript is likely used as a stager to launch further malicious activity. The ML classifier strongly supports the malicious nature of the file. No specific family could be identified, but the techniques suggest a downloader or initial execution stage.

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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