PDF malware analysis — malicious · ff086935a376445e

MALICIOUS

PDF

1.9 KB

MD5: 9c22ee42f4de13ca3f26c1d21a0f8c30 SHA-1: fac4331386f77ff8fd6a39329c19212be93cfb62 SHA-256: ff086935a376445e0a57ab6f52603ac59b4f80da7ee550e37b4456008617e6ff

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes eval() and String.fromCharCode() for obfuscation, which is a common technique for executing malicious code. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves leveraging JavaScript execution within the PDF to deliver a payload, likely for further exploitation or malware deployment.

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_obj0009_000.js` `64fb2d96b7cc82249487884347502a6d6b5e77c92c77969bcb375669fe760f69`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	8088 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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