PDF malware analysis — malicious · 0e4da88e831f0b3c

MALICIOUS

PDF

4.6 KB

MD5: 9acd1e37b666b8014521064bd5c8354c SHA-1: a7cd0f62647745be7681cefb1386f224042e18f1 SHA-256: 0e4da88e831f0b3cda3f35d5ec35131a19f16ab5546678fc7277eb2a6b669819

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that is heavily obfuscated. The script reconstructs strings to call JavaScript functions like 'substr', 'charCodeAt', and 'fromCharCode' to decode a payload. The script's ultimate purpose appears to be downloading and executing a second-stage payload, as indicated by the use of obfuscated strings that likely form URLs or commands. The ML classifier and heuristic firings strongly suggest malicious intent.

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` `725b7386f6e9caae9e03f9492eb7f26f190197c23637c755c72761214d6aafe9`	pdf-javascript-stream	PDF /JS object 11 at offset 0xC9C	852 bytes

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