PDF malware analysis — malicious · a2b294879dceef95

MALICIOUS

PDF

118.5 KB

MD5: a70647e150e5b16afa864cd2b61a9e5c SHA-1: 3db837465cd60b1f3d8d6947f76a3d7efdbff9a5 SHA-256: a2b294879dceef95a42637c6fdaf19f143f3719f680c7b1517d5708a055a8037

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a large, comment-padded eval stager. Heuristics indicate the use of eval() and String.fromCharCode, suggesting obfuscation and dynamic code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicates an exploit attempt. The document body was unreadable, but the presence of JavaScript and exploit-related heuristics points to a malicious payload 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` `cdb744259dd693849f9f4acff6b90c7511e6baa63abd16f87c74fcb838941f74`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627701 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` `80b9761e24694b94a9f743e6b0377887fb4c74253cd1aef512de55b82f1f3f93`	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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