PDF malware analysis — malicious · cbfa93a4f1cd5377

MALICIOUS

PDF

118.7 KB

MD5: 8ad558e0f8cf902c2c6d5b8e719201d7 SHA-1: 08b70264f0a8ac4d1b3f2e78347428067bbcc06d SHA-256: cbfa93a4f1cd5377a8676be48ffded7d65a82ddc62b939feda61d54de45a0637

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36086. Static analysis reveals multiple JavaScript-related heuristics, including a high-severity 'Large comment-padded JavaScript eval stager' and a 'PDF_EVAL' call. These indicate that the PDF is designed to execute obfuscated JavaScript, which is a common technique for delivering second-stage payloads or exploiting vulnerabilities. No specific URLs or network indicators were extracted, but the presence of JavaScript and the ClamAV signature strongly suggest an exploit delivery mechanism.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `ad7a555e9667f3d90ae9d6c304870cda2dfcfa694ef25d21d23b0a1a134027ba`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626935 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).
`legacy_pdfkit_stage_000.js` `0fa505640c931bdd01e1f5ed6548a6425211d3ac7c059eee67e9db7985df42a4`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 573 long base64-like blob(s).

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