PDF malware analysis — malicious · 4d8b5c5cbc60a29e

MALICIOUS

PDF

1.9 KB

MD5: d0eb9e67b5b45756602cda72e57d9547 SHA-1: d6395bd1993e20164211282129cec9f437f96108 SHA-256: 4d8b5c5cbc60a29ee01f7a7ca4576dd0abb700a8147be1b076cf85c8cb85e627

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is heavily obfuscated using `eval()` and `unescape()` functions. Heuristics indicate this JavaScript is designed to download and execute a secondary payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to the Pdf.Exploit.Agent-35930 family.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-35930 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35930
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `f23e505f155bfa9b9f356fa9fddf8d7fcafcc37fc2df3878e575e72c00c819d4`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x66F	697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d610504cc736ba69ce01b2ddcc602dc4b36c925d88c896ed7385bfb4807b0249`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2834 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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