PDF malware analysis — malicious · 424c70c6a00e1ed9

MALICIOUS

PDF

15.1 KB

MD5: b98f36616de59e0d3bff11ca8d690caf SHA-1: 5248425f0712c49878127205700389848ddba0af SHA-256: 424c70c6a00e1ed937cdc21859fa697253e538ae0dba468c73333dacfc7f8b59

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The extracted JavaScript files, particularly 'legacy_pdfkit_stage_000.js', are heavily obfuscated but appear to contain eval() calls and String.fromCharCode, suggesting they are responsible for downloading and executing a second-stage payload. The exact URL or execution method could not be confidently determined due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0004_000.js` `402d9c292f1d00d55fc9832eb2de03ed5fb03cdcbecccabfa700d1ba20d068a7`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	307 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `5c14d9d31d1500ab8dd8073808b2c457b331d91cbcfd68ca3f434712329f98f0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1936	12008 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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