PDF malware analysis — malicious · 4ac6f708720b791d

MALICIOUS

PDF

5.1 KB

MD5: db893d88adc685aaf66112d13deb4c87 SHA-1: cef83daf3a49b9b860e2ec2ca4a63c2fbd18bbc3 SHA-256: 4ac6f708720b791d7b07681b93eee5ccc416a8c972a4c388eeed2744e9072adc

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL heuristics. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0427_000.js', likely contains code to download and execute a secondary payload, a common technique for initial access.

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_obj0427_000.js` `7130430482d3a9c7826b772d3e6473aeb706270feff31b32a9769f418bd52593`	pdf-javascript-stream	PDF /JS object 427 at offset 0x132	8368 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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