PDF malware analysis — malicious · bc3104d25774c05d

MALICIOUS

PDF

118.7 KB

MD5: 14b5f7d688dcb4dd0991246e724cbf31 SHA-1: 8a4bf7f633781208f16230c8c74d618ef7739715 SHA-256: bc3104d25774c05de932d6f916d1bec1090a08c90b9f6fe457e5dfc8d247a27d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Attachment

The PDF file exhibits multiple high-severity heuristic firings related to JavaScript execution, including eval() calls and a large comment-padded JavaScript eval stager. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The embedded JavaScript stream, identified as suspicious due to obfuscation and a long encoded blob, is likely responsible for exploiting vulnerabilities within the PDF reader to download and execute a secondary payload.

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` `6ee63e1c643bf7b3e1f1a93f20ba64d362c42fb15bb9ba2a3270ede2fca3cbef`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627123 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).

Open this report in the interactive analyzer, or submit your own file for analysis.