PDF malware analysis — malicious · eddffd05d2c55f67

MALICIOUS

PDF

23.6 KB Created: 2009-08-20 10:11:53 Authoring application: mocznwtsv (via duobhcak)

MD5: e906f0d923a435a97e1410a50880e9c0 SHA-1: b891a626b9c64ca0f58f0d040d4683422865f727 SHA-256: eddffd05d2c55f67cb2697f1b3039f807262657262c7bdf7d741687a40281302

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript uses String.fromCharCode and eval() to execute code, a common technique for downloading and running second-stage malware. The ML classifier strongly flagged this PDF as malicious. While the exact payload or download URL is not directly visible due to obfuscation, the pattern strongly suggests a downloader.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `f49ca6224fac0784055e9cc8860abd6a7f377ac2084e8e8045b9dadcc9d7e551`	pdf-javascript-stream	PDF /JS object 13 at offset 0x39A	22834 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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