PDF malware analysis — malicious · 0005bb1f27dac0d6

MALICIOUS

PDF

4.8 KB Authoring application: Qdiuebouavija (via c8057Gidergav)

MD5: 7f788f6ea38ac9e33f56b374ad7b4700 SHA-1: d69c385774e4ccfbb0b4baea04216f4b9c117e87 SHA-256: 0005bb1f27dac0d684e46977a1eaeb0fb60bdf18d461ac8bd3b805afec64234e

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, identified by heuristics as a stager. The script attempts to deobfuscate a string by XORing characters with a key and then executes the resulting code using `eval()`. This pattern is commonly used to download and execute a second-stage 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_obj0011_000.js` `23ab1179d859a0416b8dc566d02ddd38009fb2dc5335e5d7ee64ae10728d232e`	pdf-javascript-stream	PDF /JS object 11 at offset 0xE49	581 bytes

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