PDF malware analysis — malicious · b88ec540b016e73a

MALICIOUS

PDF

4.5 KB Created: 2010-04-30 20:47:26 Authoring application: Fodebarexa

MD5: 65bdb5d9501e19692f7c43d6d45716f0 SHA-1: 7db32da0cc5a669622dfd14dc236c34740d50e28 SHA-256: b88ec540b016e73a98f911442446343146183874736c129c85f37be2ad8475e9

88 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. The ML classifier strongly indicates maliciousness. The JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic. No specific family could be identified, but the delivery mechanism is clear.

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_obj0010_000.js` `7ad1ee8cba7784f1a95b635244a4165fad123a151fe73c8fc9a0d61755caba74`	pdf-javascript-stream	PDF /JS object 10 at offset 0xCAB	874 bytes

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