PDF malware analysis — malicious · 3477da3607b0a4bd

MALICIOUS

PDF

118.6 KB

MD5: 4e510c49d1c7dd286aa8be3aad9e389e SHA-1: 2be067822a91980528983007460ff62f23af0d7d SHA-256: 3477da3607b0a4bd815025cdaa79e2c9cbbd66343160e88d01582ed194b111db

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, with heuristics indicating the use of eval() and String.fromCharCode, suggesting obfuscation. A critical ClamAV detection of 'Pdf.Exploit.Agent-36086' strongly indicates a malicious exploit. The presence of large, obfuscated JavaScript stagers points towards a downloader or dropper mechanism designed to fetch and execute 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` `78a1be1ba90df896c4b183eebd6f8f6365626ea249ca7f93c4cbd68058c8098f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626801 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` `04ed9b3723317e42166c8622f57697e8e09fba9fb468998fdf47331e8493e859`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 553 long base64-like blob(s).

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