PDF malware analysis — malicious · 7c53c3cf70573fcf

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via d9968Ylojoppekaxopqi)

MD5: e33cb607416b4761543ae85a4c3016fa SHA-1: 0f1579397a977037862e458e6272deab055ce816 SHA-256: 7c53c3cf70573fcf407f95b013b6934c6cc962931431febefc1c00258704e629

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that is obfuscated using XOR and string concatenation. The script's primary function appears to be deobfuscating and executing a second-stage payload, likely by reconstructing and evaluating a JavaScript string. This is supported by the 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristic. The ML classifier also strongly indicates maliciousness.

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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