PDF malware analysis — malicious · cb709f3edb883f61

MALICIOUS

PDF

118.5 KB

MD5: 95c2a1323b1ea058f079c23f7c3da171 SHA-1: c3043793fe5750774fc3ab3fa1c1c6ac3a1ebc8d SHA-256: cb709f3edb883f618bf21c338215e55e46d9481c8793152fbb6e1f789e48fc6c

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 uses eval() and String.fromCharCode. This pattern is indicative of a stager designed to download and execute a secondary payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports its malicious nature. The embedded JavaScript stream, despite its obfuscation, strongly suggests the primary intent is to compromise the user's system by fetching and running additional malware.

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` `22edfaf60deeba171221a0191bc4a57724b555b62b4132289540ecf38f095f80`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626685 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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