PDF malware analysis — malicious · 32aaf8450ee57bf1

MALICIOUS

PDF

22.4 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: c5b9ee492f8ee688eece901c1fce6726 SHA-1: 484789599e87fdc399b87888c547b37739da8087 SHA-256: 32aaf8450ee57bf1fb0aa67accefb6afdeb08ef8b22330a34814377cadd9e78d

96 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and the ML_NYX_PDF_MALICIOUS firing strongly suggest malicious intent. The extracted JavaScript file, javascript_obj0001_000.js, is likely responsible for executing the malicious payload. The use of String.fromCharCode and eval() points to obfuscation techniques commonly used to hide malicious JavaScript code.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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_obj0001_000.js` `6a8d0a6e55e722dfb9234c5e6553dc10d04c3a745b8890cb822f9e4b83a5b329`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	513 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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