PDF malware analysis — malicious · 263b1b992794adfc

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via ba239Ylojoppekaxopqi)

MD5: df8028fe4963bfcb3f6b9ebfd704776a SHA-1: ceb2e93a606eafcb0cf8b34871f10c9c69c55a6a SHA-256: 263b1b992794adfc6b7011b3b73bd348e8e0d80f0029ce9e285871fecbec9cca

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF 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 designed to launch a stager, which is a common technique for downloading and executing further malicious content. The ML classifier strongly supports the malicious nature of the file. Due to the obfuscated nature of the JavaScript and the lack of specific indicators for a known family, the family is classified as unknown.

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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