PDF / .TXT malware analysis — malicious · 69ee5e47498f2049

MALICIOUS

PDF / .TXT

6.6 KB

MD5: d833c329faab8e2717900e097aa24568 SHA-1: 502aa4a05afad7fdecb864c90540a7bcafff607a SHA-256: 69ee5e47498f2049dd2d1142e2801591a5287ee066998c84183327705da4c51a

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing obfuscated JavaScript. The JavaScript is designed to deobfuscate a string and then execute it using the 'fromCharCode' method. This pattern is commonly used to download and execute a second-stage payload, indicating a malicious intent. The ML classifier strongly supports this assessment.

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_obj0018_000.js` `64dbb1b26294330f72a9c5b7a7778b4e255c7b7609626eddfee2e06a530f4473`	pdf-javascript-stream	PDF /JS object 18 at offset 0x14F2	1021 bytes

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