PDF malware analysis — malicious · 68ad5be0cb59097f

MALICIOUS

PDF

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

MD5: 2f18a2d31898fef2c29e26bf283715a0 SHA-1: 979f0c89f19b7cbe6388e9fb3eb7d28bad05612e SHA-256: 68ad5be0cb59097f774b9c948a7d937a2020edea52ac4e2632ffccf0b059cec7

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is obfuscated but appears to be a stager. The script reconstructs strings and uses XOR operations to decode and execute a payload. The primary function of the script is to download and execute a second-stage payload from a remote source, indicated by the use of 'getPageNumKxwyRXlWords' and 'fromCharCode' which are common in PDF JavaScript exploits.

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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