PDF malware analysis — malicious · 762b3ffeeca5079e

MALICIOUS

PDF

4.1 KB

MD5: f7b0a5d9eca5196812c1ab6df65b97bd SHA-1: 1529423b8d450c7b1f260cf778db79c86b0536ea SHA-256: 762b3ffeeca5079e427bef4002856879e8c2bf164ea65d80f37243762bd97cf6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests obfuscated JavaScript code is being executed. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript streams, javascript_obj111611_000.js and javascript_obj111612_001.js, are likely responsible for downloading and executing a second-stage payload.

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. (matched inside decoded stream)
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_obj111611_000.js` `e9adc1ce7504fd168ea8eb6c14f241bf83419b948c2a2cd9621beba2b4c6f8b5`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `1207a0327d16fa4569a1553678666005493b3d52a2c59d6cf3b3de457b0700cf`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	5596 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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