PDF malware analysis — malicious · fdd8e240471dc784

MALICIOUS

PDF

5.3 KB Created: 2008-12-03 13:57:41 UTC

MD5: 2c6da19d271219aeec6518a57c7081b1 SHA-1: e7dc38c5772f7cc02b8bca7adb93a1462192cb67 SHA-256: fdd8e240471dc7843fe979e634cee0831bff5afa42a3d8fb54c815f3a79ee7c1

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call and String.fromCharCode within the JavaScript stream suggests code obfuscation and dynamic execution. The ML classifier strongly flags this PDF as malicious. While the exact script functionality is obscured, the combination of these factors points to a malicious PDF designed to exploit vulnerabilities and execute arbitrary code.

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_obj0006_000.js` `40db144e8460160d437c2978900f50538deae586ae1ccf7b9231cf0009e0df7a`	pdf-javascript-stream	PDF /JS object 6 at offset 0xC5	8800 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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