PDF malware analysis — malicious · ca36666d50945c76

MALICIOUS

PDF

291.8 KB

MD5: c6db59d2250dabc450eddab6f1b22123 SHA-1: 2402fd1f7b67485eeeefb16770802ae6e48ed42e SHA-256: ca36666d50945c76e1d1c79a3875ce2ed9b37608a748e6b732fbc9ac7ef368b6

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file 'javascript_obj0008_000.js' is likely responsible for executing the malicious payload, potentially involving obfuscation as suggested by the 'Script obfuscation indicators' signal.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0008_000.js` `4a0c796480e3e9ba8eb6cefd2c707aa70db576e72923bb94f658e5b5c23ff108`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1CE	99336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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