PDF malware analysis — malicious · 3c78569f77af8b85

MALICIOUS

PDF

27.8 KB Created: 2009-04-15 06:32:06 Authoring application: LdPgGa (via AAGTiG)

MD5: 974809e09360b1bbbf27c80704a9bd25 SHA-1: 64c694f5a4a04854bfe2ccf41c8223538c96e370 SHA-256: 3c78569f77af8b85b7190eb52db9ad62b2a4be2ee2cff50d2873f2d37826851b

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes `eval()` and `String.fromCharCode()` for obfuscation, a common technique for hiding malicious code. The ML classifier strongly flags this PDF as malicious. The primary intent appears to be the execution of this obfuscated JavaScript, which likely downloads and executes a second-stage payload. No specific family could be identified due to the 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_obj0007_000.js` `f018309cdc12d58a37a07719e517c1914f99b0dfd5d320c7db8b9383bd362f57`	pdf-javascript-stream	PDF /JS object 7 at offset 0x239	27247 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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