PDF malware analysis — malicious · 04626a46b1db1dfd

MALICIOUS

PDF

9.5 KB

MD5: 10b8135a4cb8cc0b96161824a7710afd SHA-1: 38ab900ed3cd12e7c514304b0abc7daf54c21a0a SHA-256: 04626a46b1db1dfdf0b244c8151590dea900c6dcc087f6df3226fa710e1e74a8

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including ML classification. The JavaScript stream is obfuscated and appears to be designed to download and execute a secondary payload. The presence of 'unescape()' and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. No specific family could be identified due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0007_000.js` `d6888a9722624b0d59d24de158000af1f07752a411e680d67220a9f29b7e1fe1`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	40918 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 209 eval/decoder/string-building token(s).

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