PDF malware analysis — malicious · 8ec05dff04abbb5e

MALICIOUS

PDF

5.1 KB

MD5: eeb6f516737d1abc0012e6e222cb4325 SHA-1: 21d5557efad714c715dbe16bc75fd2645cdf31c6 SHA-256: 8ec05dff04abbb5ef550bea9f8c1ff868adaa7e60ee59b68af6baa7cfb5fbb3d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() to execute code. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, javascript_obj0894_000.js, is the primary artifact, and its presence strongly suggests the PDF is a dropper or downloader for further malicious activity.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0894_000.js` `fb87fa0f9432234ea052f72781c3ba65440ad3810081e278b890660f8304f618`	pdf-javascript-stream	PDF /JS object 894 at offset 0x133	8353 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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