PDF malware analysis — malicious · 20e401ca2068dc1e

MALICIOUS

PDF

118.6 KB

MD5: 444f5397dcf6536b00d587f02a91751e SHA-1: d86e8e95a19314588d19963bee844ebab84ceb3a SHA-256: 20e401ca2068dc1ec6516830237a3f95cf9a2f761818419eca0881edd341c7e1

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1059.003 Windows Command Shell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large, comment-padded eval stager. This JavaScript is heavily obfuscated and uses eval() and String.fromCharCode(), indicating an attempt to hide malicious code execution. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature, suggesting it's designed to exploit vulnerabilities within the PDF reader.

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` `8e545baf96cf579365b31ca9682a2e9f08123f7c35d888efb75372fc1bb61a4d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626698 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).
`stream_002_off0001d8a4.bin` `c346164281f9eae111af3376f699991a3b0cb1e46b0043fd0486d2249cd34dab`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D8A4	200 bytes

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