PDF malware analysis — malicious · cd2eeb55671c44d6

MALICIOUS

PDF

14.0 KB

MD5: 132b61f09238a89ac97e0e1d09232f94 SHA-1: 0c5ba5ad2ae10d6446fdca7b28694d1a89cc1ddd SHA-256: cd2eeb55671c44d6678f956a00967e8fee5e2e2958ed9ab348bab2d879bf5105

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript streams, named javascript_obj3332_000.js and javascript_obj3332_001.js, are likely responsible for obfuscating and executing malicious code, potentially downloading a second-stage payload. The presence of unescape() calls and ASCIIHexDecode/ASCII85Decode filters further suggests code obfuscation and exploitation attempts.

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 0x35CE	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 0x3600	482 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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