PDF malware analysis — malicious · e8bc5b3df9f988a6

MALICIOUS

PDF

4.0 KB

MD5: ea412fa6b185e6b1722cb1880d0a6a5e SHA-1: 244340c0465914f158d8a55a39bf80d68615a4f1 SHA-256: e8bc5b3df9f988a60cce25856105ca26121196e26995827c8ec67c5cffae8511

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF with high confidence. The embedded JavaScript streams, named 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are the primary mechanism for malicious activity. While the exact script functionality is obfuscated, the presence of eval() and String.fromCharCode suggests dynamic code execution, typical for downloading and executing further stages.

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` `b75a869bccd0e4b5b0ba829d34572d1cb802b03b44b3970e193ebf8e4d45e9e7`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `0903edd3b95b802901de35258656c83d0f424a1be20c2a38145611461155eba6`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	5612 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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