PDF malware analysis — malicious · 45ecf21cb589788f

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via d1f9dYlojoppekaxopqi)

MD5: 1a4c5d6c97d8edea27eee4da479d51d2 SHA-1: bd36eec3bf5b9738f8f37671e7d00775ad0ecec1 SHA-256: 45ecf21cb589788f88524e454118e8ef906371830336d4f523ae4b0b6f2d5bcb

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by heuristics as a 'Page-word XOR JavaScript eval stager'. This suggests the script is intended to deobfuscate and execute malicious code. The ML classifier strongly supports a malicious verdict. The primary function appears to be the execution of a second-stage payload via JavaScript, though the exact nature of the payload and its destination could not be fully determined due to obfuscation.

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_obj0008_000.js` `c510f8c6a5031d17c6606a6a4e88ede1c3452bf51c2d06efb7ba03d3692fec56`	pdf-javascript-stream	PDF /JS object 8 at offset 0xF52	1346 bytes

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