PDF malware analysis — malicious · 0c36ea82e9851f1e

MALICIOUS

PDF

4.5 KB Authoring application: Vabameuaki

MD5: a59ccbd67a820c5f8b34faa34578b4aa SHA-1: 03d157bd1bebb1bb0e165e4087a6e25f1628de93 SHA-256: 0c36ea82e9851f1e4f19ecc254f26031baa7326fae39892bd47203547e4358c4

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that is obfuscated using XOR and string concatenation. The script reconstructs the string "fromCharCode" and uses it to build a payload. This payload is then executed, indicating the PDF's primary purpose is to download and execute a second-stage payload. The ML classifier and specific heuristics strongly indicate malicious intent.

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` `1ec398366107a5fedd9bcf18a57f32d68d58e87986c8ad1c876f457b209e2152`	pdf-javascript-stream	PDF /JS object 11 at offset 0xCA2	815 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.