PDF malware analysis — malicious · 49d9b3c6a34cd95f

MALICIOUS

PDF

4.5 KB Authoring application: Olaxogesmeuaqo

MD5: f06d98121a698e88037fa3d3f431ef9e SHA-1: 5eb65fec4757b58eeaea1654a04daa38ae3fbd2a SHA-256: 49d9b3c6a34cd95fc9e84a59aad3fea6c7eab76483bab40b8def486843926124

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. Heuristics indicate a JavaScript eval stager, suggesting the script is designed to de-obfuscate and execute further malicious code. The extracted JavaScript stream, 'javascript_obj0011_000.js', is the primary artifact of this malicious behavior. The document body is heavily obfuscated and does not provide clear textual lures.

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` `a3581823db46253b79d29049bc0ef13ae6abf63b84aec7e9a12c4f592a9fecc7`	pdf-javascript-stream	PDF /JS object 11 at offset 0xCAD	786 bytes

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