PDF malware analysis — malicious · 04b45ec36e9df91c

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via 7cd7fYlojoppekaxopqi)

MD5: f7e9c5e83e62b6d7850909d844356133 SHA-1: dc648bcf7d1759c33dd3c128d86c5346a7c0f14a SHA-256: 04b45ec36e9df91ce0d7464755f9580d72affac75f70ae562fe757011bd993b3

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file containing obfuscated JavaScript. The JavaScript is designed to decode and execute further malicious code, likely to download and run a second-stage payload. The 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic confirms this stager-like behavior.

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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