PDF malware analysis — malicious · 39bd2c267b5324e9

MALICIOUS

PDF

118.7 KB

MD5: 14e25c7a502a76227a1543edee1d28e6 SHA-1: a47d9192323163d2f29c10f25b55ca9ca7162b50 SHA-256: 39bd2c267b5324e9192c185c1b6172ff6787fa2d5a6ba0d30dce6644d6395708

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode(). A critical heuristic indicates this is a 'Large comment-padded JavaScript eval stager', suggesting it's designed to deobfuscate and execute a payload. ClamAV also detected it as 'Pdf.Exploit.Agent-36086'. The primary attack pattern involves leveraging JavaScript within the PDF to achieve code execution, likely to download and run a second-stage 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` `5a873359a1a4e5ec4f255576e16c03ed9eb420e993f34ed97b3e957eb5064f04`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627936 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).

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