PDF malware analysis — malicious · f050b434800f2a8e

MALICIOUS

PDF

118.6 KB

MD5: d01d0f6826e04737999384867d720c65 SHA-1: 3241c2083bd0e08bddc8efda301f872d1d030678 SHA-256: f050b434800f2a8e7ff81565c6cfe9510f5f2ae4e23cd90e3b613ae7b2706d84

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a call to eval() and a large comment-padded JavaScript eval stager. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', indicating it's a known exploit. The presence of JavaScript and the ClamAV signature strongly suggest the PDF is designed to exploit vulnerabilities and download further malicious content.

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` `5dcd654298b0d810f68d8fd2472f4f05381387fee2f73ce0c3628ff7f5c1ec91`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626909 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` `a7c1e80d2536c82d3c1431d19828f2e8c9fcd3e5eb840599539a5b6b89b572d9`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 697 long base64-like blob(s).

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