PDF malware analysis — malicious · fdb240b68656c427

MALICIOUS

PDF

4.6 KB Created: 2010-04-21 04:29:36 Authoring application: Hedexabikicaseji (via Jamakatoqvijan)

MD5: 9e08c82ab6f38a2dbe37b88e16c729bb SHA-1: d038bcab04dd772def4b71174be36ae434c727f4 SHA-256: fdb240b68656c4278d911e6683f438b203596524e81eb897e2a8c52b80a0bbfd

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by heuristics as a 'JavaScript action' and 'Embedded JS stream'. A high-severity heuristic 'PDF_PAGE_WORD_XOR_EVAL_STAGER' indicates that the JavaScript is obfuscated and likely acts as a stager. The ML classifier strongly flags this PDF as malicious. The presence of JavaScript, particularly an eval stager, suggests the primary purpose is to download and execute a second-stage payload. The XOR-encoded byte sequence 'b8 bb c4 d3 c0 92 c1 c0' is likely part of the obfuscated JavaScript payload.

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` `ce6c4cce330f57d4fb1e02fda9239c0607f17a9fc0a83e673e57dbf5e551fcf0`	pdf-javascript-stream	PDF /JS object 10 at offset 0xC84	1197 bytes

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