PDF malware analysis — malicious · 088c06b156bbf0ae

MALICIOUS

PDF

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

MD5: 7d664c98e1f69860a49e4b765b0d399f SHA-1: e2718060b8527ecb5c2ccb55730d3a8d96a3e64f SHA-256: 088c06b156bbf0ae7870a0da3635cd4e4a4c2281d9a397a50b1b64aa79e4620b

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript, identified by multiple heuristics including 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The script reconstructs a string by concatenating substrings and then uses it to download and execute a second-stage payload. The reconstructed string appears to be a function call related to JavaScript execution within the PDF context.

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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