PDF malware analysis — malicious · 9c5adaffe97ba635

MALICIOUS

PDF

7.0 KB

MD5: 1943f96c970ad36e2fb020c46f485311 SHA-1: b04486f24b89061ed44b425fbaea6c8263be1bda SHA-256: 9c5adaffe97ba6359f3cbb72b4197ff4f2aa42f878db2fc334bb8263f4c8d7c2

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier also flagged this PDF as malicious with high confidence. The presence of an unescape() call and the ML_NYX_PDF_MALICIOUS firing suggest the JavaScript is obfuscated and malicious. The extracted artifact 'javascript_obj0009_000.js' is likely responsible for executing the malicious payload, potentially downloading additional malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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_obj0009_000.js` `c45b8050335dafbd49c56022f7b2d9396ab1fd811568b100c6fb7a4e9d5994b8`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	5695 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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