PDF malware analysis — malicious · 4a250c43e1de8656

MALICIOUS

PDF

10.7 KB

MD5: cc434bb80091fa10a1d0143cd7aa65bc SHA-1: 8db7c036f48f6ce93966a0c235f817fb430a6739 SHA-256: 4a250c43e1de865687f58bec6b63ddb4177cf65d1a8e76b0efaac6c41c20b8f0

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded, obfuscated JavaScript. The JavaScript stream, identified as 'javascript_obj0007_000.js', utilizes an unescape() function, indicating an attempt to hide malicious code. This script 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

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_obj0007_000.js` `6ff7bad4000bab8fabeaf9862dca88c3f18aae3e6b0ce89bf90376504e80eae3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	48183 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 232 eval/decoder/string-building token(s).

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