PDF malware analysis — malicious · 97bc214199a05964

MALICIOUS

PDF

26.8 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 0f3e189c59530ac91423fa23b64401d7 SHA-1: b67e1f85062fd8d03825c901f3753c9784869ff1 SHA-256: 97bc214199a05964f1e659d75d6710fa300569022a0877fd822214bbbb005149

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains obfuscated JavaScript, indicated by the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL' heuristics. The 'ML_NYX_PDF_MALICIOUS' classifier strongly suggests malicious intent. The JavaScript likely executes arbitrary code, as evidenced by the 'eval()' call, which is a common technique for downloading and executing further payloads. The 'String.fromCharCode' usage further points to obfuscation.

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.
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_obj0001_000.js` `ab41288e8b212ab411173a6cfcb4515212acbee9c86098a7cb9f4db9296729cf`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	524 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

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