PDF malware analysis — malicious · e78e1f11d7cb843a

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: c8badab4fa30d92752ee2bc13af042bc SHA-1: d62b7592f66d2c67a6fc4283ec2950ab7ac76dfe SHA-256: e78e1f11d7cb843aa624656c5082d9ac0d186853f9832b0ed636e3d1c8994dcf

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple high-severity heuristics including a 'Page-word XOR JavaScript eval stager'. The ML classifier also strongly indicated maliciousness. The embedded JavaScript stream, named 'javascript_obj0011_000.js', is likely responsible for executing the malicious payload. The exact intent of the script is obscured, but its presence and the stager heuristic suggest it's designed to download and execute a second-stage payload.

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` `1ec398366107a5fedd9bcf18a57f32d68d58e87986c8ad1c876f457b209e2152`	pdf-javascript-stream	PDF /JS object 11 at offset 0xCA2	815 bytes

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