PDF malware analysis — malicious · a941c176a22958f1

MALICIOUS

PDF

50.9 KB Created: 2aJH%bpjVohOLFwtXCys6xmleYA4WUgdSvPcNrK0RnEQz579MifBZ3qu1GT8IDk Authoring application: Creator

MD5: ace248c6f750b84c447f954cbd11817d SHA-1: 2f0dafab670393c34105ff65877713e7e4c22006 SHA-256: a941c176a22958f16c0ff2e60184fc41149596c5b61ced9bdf4fca94d8bbb770

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly indicates maliciousness. The JavaScript stream, specifically the unescape() call, is used to decode and likely execute a malicious payload. The extracted artifact 'javascript_obj0018_000.js' is the likely second-stage downloader. The overall attack pattern is a PDF-based exploit delivering further 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_obj0018_000.js` `a9326f1047fc7b68ff06547796e34d337fb30745e329ad713eb6799b5dc6cffe`	pdf-javascript-stream	PDF /JS object 18 at offset 0x4BA	25510 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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