PDF malware analysis — malicious · 413600f8637ed504

MALICIOUS

PDF

5.0 KB Created: 2010-08-01 07:24:31 Authoring application: Mawdokaz (via f3ba7Zefikepeziliyfi)

MD5: e7e201160a7d146e6a23508656fb7bd2 SHA-1: e628dfaaa45e9bc7052c88738bf723635823eba6 SHA-256: 413600f8637ed504aed82997291803a9e3233ac9363207682df19694be8aebeb

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics as a stager. The ML classifier strongly indicates maliciousness. The JavaScript stream, named 'javascript_obj0011_000.js', is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `9142a1300d6f6a99eb4af0ba56c49a0a38bebff77798d40227fa8d62d328d822`	pdf-javascript-stream	PDF /JS object 11 at offset 0xEDB	535 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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