PDF malware analysis — malicious · c22287e507889254

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via 78044Ylojoppekaxopqi)

MD5: 33db6b4049bd45ec1aacdef6428058ce SHA-1: c2350d63a084eb2be385088ae1bd0239b64c5c32 SHA-256: c22287e507889254c0eefcd2061414153ac6bbd7c92e36fb21ec0bc11ada0d93

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript, identified by heuristics like 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic indicates that the JavaScript is obfuscated and likely acts as a stager. This stager is designed to download and execute a second-stage payload, a common technique for initial access and further infection. The ML classifier also strongly indicates maliciousness.

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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