PDF malware analysis — malicious · 7a8ecbd550a411af

MALICIOUS

PDF

14.1 KB

MD5: dc5809d696d004681f60e874c2037d4d SHA-1: 94b59cb3b1a7934d96078ecb1ffb55c12650e003 SHA-256: 7a8ecbd550a411afac1cdf42f01ffe9eceb1186b1535aa6fceece711acee97fa

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: Malicious File

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The JavaScript streams, particularly javascript_obj3332_000.js and javascript_obj3332_001.js, likely contain obfuscated code designed to exploit vulnerabilities or download further payloads. The presence of unescape(), ASCIIHexDecode, and ASCII85Decode filters further supports the malicious intent.

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 0x3638	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 0x366A	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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