PDF malware analysis — malicious · 102771107cc24869

MALICIOUS

PDF

6.3 KB Authoring application: Woibneqeni (via 53d9bUzenwzijecijawida)

MD5: 2a135e85d228510ac05b40af16ef72ce SHA-1: 6eec5d210274b0fa39dd72e2d13da13979102992 SHA-256: 102771107cc24869dfe1af88b6a5f1cf798a30ab199add96fd1b0aedffc71d4c

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 and execute further code, likely to download and run a second-stage payload. The presence of PDF_JAVASCRIPT and PDF_PAGE_WORD_XOR_EVAL_STAGER heuristics confirms the malicious intent of the embedded script.

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` `e5fb7241b86520d30618ed164f0373984e043b354e933bd4bfa81c848e06fafc`	pdf-javascript-stream	PDF /JS object 10 at offset 0x11B0	1464 bytes

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