PDF malware analysis — malicious · b0cdd5116d280254

MALICIOUS

PDF

1.9 KB

MD5: eb5c00dd44c7188ba58d5a5688f21521 SHA-1: ba2f30c169456c01220a40cf9cdc73e5d2ae8a55 SHA-256: b0cdd5116d280254a0be74fc5396308dc1a91fab9bad87c9b3eef4a22020fcd2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF as malicious with high confidence. The obfuscated JavaScript, particularly the use of eval() and String.fromCharCode, suggests an attempt to hide malicious code execution. While the exact payload is not immediately clear due to obfuscation, the presence of these indicators strongly points to a malicious document designed to execute arbitrary code. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `d90a929202ba141709cd9649883c6308805a748511663a73e196b43686d535c4`	pdf-javascript-stream	PDF /JS object 5 at offset 0x117	1441 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0005_001.js` `8728ed87a034b40315990dd735f018b8b072f6e81f85827f7d79964a10e46a7c`	pdf-javascript-stream	PDF /JS object 5 at offset 0x117	35 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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