PDF malware analysis — malicious · 123e09e70d93f248

MALICIOUS

PDF

4.6 KB Created: 2010-04-30 20:47:26 Authoring application: Fodebarexa

MD5: 32f1d8df33817d094cdc5ae0b0520718 SHA-1: e6098572572eb8d8d1a0436aa74d44deaf84a891 SHA-256: 123e09e70d93f248a2c8400d290d6e4e033d4c30e4f7ae5be23cb006f8e91854

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript that is obfuscated using XOR and string concatenation. The script appears to decode a string, likely a URL or command, and then execute it. The high-severity heuristics 'PDF_PAGE_WORD_XOR_EVAL_STAGER' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The script's primary function is to download and execute a second-stage payload, as evidenced by the use of JavaScript for execution and the ML classifier's output.

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_obj0010_000.js` `7ad1ee8cba7784f1a95b635244a4165fad123a151fe73c8fc9a0d61755caba74`	pdf-javascript-stream	PDF /JS object 10 at offset 0xCAB	874 bytes

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