PDF malware analysis — malicious · eb50a7f178792b66

MALICIOUS

PDF

118.6 KB

MD5: d9d8900bb8a804ac150a21d52a707d61 SHA-1: e3b7045f1b778200c71635606c6fc4a0c7139bcd SHA-256: eb50a7f178792b667efb0cd65ab347b6b40cc7bcd93ad34406f70ac51a70ece5

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL'. The 'PDF_EVAL' heuristic indicates the use of eval(), a common technique for obfuscating malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves leveraging JavaScript to execute arbitrary code, likely to download and run a secondary payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `e60cb6312bf6a252dfee48f6f2a65df4ec79abe1f1a61e3b029df9db63b27a1e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627558 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).

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