PDF malware analysis — malicious · 14800da057034049

MALICIOUS

PDF

4.6 KB Created: 2010-04-30 20:50:48 Authoring application: Remefehoditijol (via Navowezaxohagadetod)

MD5: 7235eef829254caafb825db6655e8325 SHA-1: 3729e18c39355432c52981b295d5773b950c3d39 SHA-256: 14800da05703404918244634ba1f26fe9b5d226cdc3b5e9d14a1504ec8460fe8

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that is heavily obfuscated. The script appears to be a stager designed to deobfuscate and execute a payload. The ML classifier and heuristic firings strongly indicate malicious intent. The script's primary function is to download and execute a second-stage payload, which is a common technique for malware delivery.

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` `ee2e511ba8ce3549b23f24d7507787bbba67f242a0b1f41c47d363925ddfc2ab`	pdf-javascript-stream	PDF /JS object 10 at offset 0xCC8	817 bytes

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