PDF malware analysis — malicious · 546b9e4198e88d6e

MALICIOUS

PDF

4.5 KB Created: 2010-04-23 06:59:32 Authoring application: Dakmiyfomimaba

MD5: c558624f282160cb6274a7f0374a870b SHA-1: 268bc6fdb7ec0a45d64e6646dc36ef563f07bcf5 SHA-256: 546b9e4198e88d6eb6a7ca561f2a75660bae94b29167d4071b4361d3a89347de

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains obfuscated JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The JavaScript appears to be a stager designed to download and execute a second-stage payload. The ML classifier strongly indicates malicious intent. The document body contains repetitive, seemingly random strings and some English words, but lacks a clear lure. No specific family could be identified.

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` `ea13fb2787f8a81942f77eaf5572aef2f3a4bf0b2b340df191d41a73b44cca26`	pdf-javascript-stream	PDF /JS object 10 at offset 0xCDD	834 bytes

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