PDF malware analysis — malicious · 8cf92f271fb7552e

MALICIOUS

PDF

26.5 KB Created: 2010-03-06 12:22:00 Authoring application: RB8K3OMK6OV (via BOu7I6flq9TUi)

MD5: e3a51df3f5a6e8636b28dec1631f6bd2 SHA-1: 1b7950f2116a640ab9535a212a2ad85845a452c6 SHA-256: 8cf92f271fb7552e52a1907ff6fa78dda6701177d535ef9d2d6d3b17b4fe3c28

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains obfuscated JavaScript, indicated by the use of `eval()` and `String.fromCharCode()`. The ML classifier strongly suggests maliciousness. The embedded JavaScript file, `javascript_obj0007_000.js`, is likely responsible for executing the malicious payload. The exact behavior of the script is difficult to determine due to obfuscation, but it is designed to exploit vulnerabilities or deliver further malware.

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.
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_obj0007_000.js` `8a62e65087873d32e94e0f9e16b297ea415d1c599c07ef5b72bcef74b27946ed`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	25873 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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