PDF malware analysis — malicious · c939c40db4c50842

MALICIOUS

PDF

14.0 KB

MD5: eb7d1dec82536a3a310404a97b92d861 SHA-1: 80a325f4e92c32a24903f33858324d5b65e44e96 SHA-256: c939c40db4c50842feb3183f3455d99c56ad197bc01a1fb42e7f9af54b204c0c

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flags this PDF as malicious. The JavaScript functions like unescape() and the use of ASCIIHexDecode and ASCII85Decode filters suggest obfuscation and exploit delivery. The extracted JavaScript files, javascript_obj3332_000.js and javascript_obj3332_001.js, are likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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_obj3332_000.js` `4377a63b8e35fe7ea470854eb986e68dc3150cba6cbbc314f6e4bc141e506e69`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x3616	418 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj3332_001.js` `47e19bf437522f8db9934d524c913bd71854176d6feac945b0290842f0d27d3a`	pdf-javascript-stream	PDF /JS object 3332 at offset 0x3648	482 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.