PDF malware analysis — malicious · c97e8392d54d9597

MALICIOUS

PDF

1.9 KB

MD5: 9820a24ca2a7c81e9ed0e4632040719d SHA-1: cefeeefa6e5b635832b3418ab1d1abae50227707 SHA-256: c97e8392d54d9597377378f7c9cbf0e531e275c99c2dfbe6cda9fbdad280e711

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF contains embedded JavaScript, which is obfuscated and uses eval() and String.fromCharCode. This JavaScript is likely responsible for downloading and executing a second-stage payload. The ML classifier strongly indicates maliciousness. Due to the obfuscation, the exact behavior of the script cannot be fully determined, leading to a slightly reduced confidence.

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` `ac19c7e6d800441247c6ab8e2feb8c4bb3418deeae5f81cf684443551b8a4c13`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	7480 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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