PDF malware analysis — malicious · 2704f9b8835c6180

MALICIOUS

PDF

8.4 KB

MD5: b4eff8127c9f0946bd04687b57ccef22 SHA-1: 51f7c577ac5073a8e49b0b6fb7a0dadd6134677d SHA-256: 2704f9b8835c6180d7f7af852e4c741acd854d9cc21dce4bc77e6605842f8a7a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode, suggesting obfuscation. The ML classifier strongly flags this PDF as malicious. While the exact script functionality is obscured, the presence of obfuscated JavaScript within a PDF commonly indicates an attempt to download and execute a second-stage payload or exploit a vulnerability.

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_obj0013_001.js` `3bd9b1bc900a3331979d820559b5d6936a9405c3d68d20c54e4f54470d637480`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	14662 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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