PDF malware analysis — malicious · e3ed4949f10c78ed

MALICIOUS

PDF

118.7 KB

MD5: 9221d844956896321a04f0a85bdb18fc SHA-1: af99ee2a06cf3c16254d776f88aa69f90ce89a7d SHA-256: e3ed4949f10c78ed99bd91f6a14cd1007af96d129e5acf7e6a97aef0f92e6866

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The PDF file contains multiple high-severity heuristic firings related to JavaScript execution, including eval() calls and a large comment-padded eval stager. ClamAV also detected it as 'Pdf.Exploit.Agent-36086'. The embedded JavaScript, although obfuscated, is the primary mechanism for exploitation, likely serving as a downloader for further malicious activity. The presence of 'javascript_obj0006_000.js' and the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics confirm the use of JavaScript within the PDF.

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` `e622dff0b4c3eab9997ebda9265c7928a5fa507151c97f2955926b694c228929`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627831 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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