PDF malware analysis — malicious · c0dac10b01efc36e

MALICIOUS

PDF

2.6 KB

MD5: 1ff3f99a381bf08b6254f9ebf2665b5c SHA-1: c1c0c638de9414af910d81a3f162241b116e0287 SHA-256: c0dac10b01efc36eb8a99e2ac99a4586e1bc03f4c4f32d0263a2a301cd65d121

98 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_EVAL' and 'PDF_FROMCHARCODE' firings suggest the script is obfuscated and likely uses dynamic code execution to evade detection. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves leveraging these JavaScript capabilities to execute arbitrary code, which is commonly used to download and run further malicious payloads.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj1179811_000.js` `afabf12a2d372bf65eb4ca445c20481819280e400f0f76ce4a5d10e139b04f8f`	pdf-javascript-stream	PDF /JS object 1179811 at offset 0x19A	2514 bytes
`javascript_obj1179812_001.js` `0c3bfac9c446fd6a0f7a4914aded51f9fb05238eeacaef58be7a92ffb05aa723`	pdf-javascript-stream	PDF /JS object 1179812 at offset 0x89D	495 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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