PDF malware analysis — malicious · 062d96d1b0e02480

MALICIOUS

PDF

4.4 KB Authoring application: Zidihahehalapovazewi

MD5: f405dd02150c53a970a53a460ee7d650 SHA-1: f71e436b9466f47536542e2007f547fde8e3140b SHA-256: 062d96d1b0e024804935aeb3c3b6c43ff3fd46179b38608071163a6f7959cb8b

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that uses XOR operations and string concatenation to obfuscate its true intent. The script decodes and executes a string, which is highly indicative of a downloader or stager designed to fetch and run a second-stage payload. The presence of PDF-specific heuristics for JavaScript execution and a high ML classifier score further support this assessment.

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` `0aa6d767da2211f8989faa309c21bbda21617d3bb9729373ee41855924aa3a82`	pdf-javascript-stream	PDF /JS object 10 at offset 0xC4A	790 bytes

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