PDF malware analysis — malicious · af060cfea2828035

MALICIOUS

PDF

4.8 KB Created: 2010-04-21 04:29:03 Authoring application: Xawefamozma (via Mmopekiqaneji)

MD5: f14d552b0f26dfb7679b7d646dad5a72 SHA-1: b63be61737b38e0a841d137079b655fa92cd0700 SHA-256: af060cfea2828035e3bfd6746bd6470d262c41aee387c4a8d519f6b7a95f3e81

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, identified by multiple heuristics as a stager. This script is designed to execute arbitrary code, likely to download and run a second-stage payload. The ML classifier strongly indicates malicious intent. The document body contains obfuscated text and what appears to be a XOR-encoded string, further supporting the malicious nature.

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` `9551cb29c148355e2c0a4889694047d07101ab5c93bed2d1b18aa9c461a0e7a4`	pdf-javascript-stream	PDF /JS object 11 at offset 0xCF5	1301 bytes

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