PDF malware analysis — malicious · 23f4fa1b541e07c3

MALICIOUS

PDF

118.5 KB

MD5: 90ed9d7dcb96cf68195746c834a371cb SHA-1: 690f26f0967e98d389086a0342d6292a8a4b214f SHA-256: 23f4fa1b541e07c397552629adbfc704839ba29fd9d0180fe0da759491f7748a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode(), which are indicative of obfuscation and exploit execution. The ClamAV heuristic 'Pdf.Exploit.Agent-36086' strongly suggests this PDF is designed to exploit vulnerabilities. The presence of large, padded JavaScript streams further supports the conclusion that this is an exploit stager. No specific family could be identified, but the techniques point towards a generic 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` `aa6a911b09dad075c480f7d8eb0435cc3eca32d429532136085878cc6f0f268f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	625551 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` `fb6ff442bebbbf94bd4f142c1147ffc4fb49ad71ce2fecd00f3557e11e0ee87e`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 594 long base64-like blob(s).

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