PDF malware analysis — malicious · e49ec431f1c9fcfa

MALICIOUS

PDF

3.8 KB

MD5: ba5440d6521b22929d2d68cc05addab4 SHA-1: 58cd994680a84f1ef8799932fbd5ea5dd8155dc1 SHA-256: e49ec431f1c9fcfa6c7c986ce0f1e4ef343bf668c19ebaa4ff842a1d85712c7d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE rules suggests that the JavaScript code is obfuscated and likely uses eval() and String.fromCharCode() to dynamically construct and execute malicious commands. The extracted JavaScript files, 'javascript_obj111711_000.js' and 'javascript_obj111712_001.js', are suspicious artifacts. The overall behavior points to a downloader or dropper mechanism, where the obfuscated script is intended to fetch and execute a secondary payload.

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_obj111711_000.js` `613644a380812a3de80b9ec58b11fd2f44870b66d0322cc2e51349a6a9211d2f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `3928cac47530f066365b271845506023013ccac3f5bd6923b013a598e683827e`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x267	5428 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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