PDF malware analysis — malicious · 7cc559f13fa89c7f

MALICIOUS

PDF

4.9 KB Created: 2010-07-21 07:46:13 Authoring application: Gadonalamiqesiwine (via a7d6bPililzatra)

MD5: e0868f1b7ae6ba73c1824c06a7a294d3 SHA-1: 1430dd6048e4ea3a7bba0457258a845cdadbf86f SHA-256: 7cc559f13fa89c7f2375a8fcf923048d4e1854ef5a031d8c14a88a897de01012

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_PAGE_WORD_XOR_EVAL_STAGER rule indicates that this JavaScript is designed to launch a stager. This stager likely downloads and executes a second-stage payload, a common technique for delivering malware. The ML classifier strongly supports the malicious nature of this PDF.

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_obj0011_000.js` `f82247786bcb48eec7f57ca8a6f2db7939deda5931dfa83caaf99f7eab044c08`	pdf-javascript-stream	PDF /JS object 11 at offset 0xE63	514 bytes

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