PDF malware analysis — malicious · c30e3411cd92b4d1

MALICIOUS

PDF

4.9 KB Created: 2010-07-13 10:02:54 Authoring application: Lnibisaxaki (via 9c97fDikigekeqcecozibe)

MD5: d9fac784bc21223a1c67cb564a74877d SHA-1: 41f83e93bfff75e5b4846d970b4283e9461c6a23 SHA-256: c30e3411cd92b4d1dd44771d7eeb12334f10fd4555bf64cffc211606209642f1

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF document contains embedded JavaScript, identified by heuristics as a 'Page-word XOR JavaScript eval stager'. This suggests the script is designed to deobfuscate and execute a secondary payload. The ML classifier strongly indicates malicious intent. While the exact payload is not directly visible, the presence of JavaScript within a PDF is a common delivery mechanism for malware.

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` `c8780ec7dfdb39cbc931dd298eb5ef3f0b24e358ab62327b245cde7c2593ac1e`	pdf-javascript-stream	PDF /JS object 11 at offset 0xEBA	516 bytes

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