PDF malware analysis — malicious · a2e5908f754217c3

MALICIOUS

PDF

118.4 KB

MD5: 24e40cfa09f56d6438da22311bccadff SHA-1: aec43ed038fcd2e6c65c87ecb75c5098c124385a SHA-256: a2e5908f754217c3f09d66b50972a53e1041b662ae24e0d6dfbae4e3714c0563

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL firings suggest that the JavaScript is obfuscated and designed to execute arbitrary code, likely to download and run a secondary payload. ClamAV detection of 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The presence of large JavaScript streams and obfuscation techniques points to a downloader or exploit loader.

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` `2fc26aec077728f184ff872285b9dc5a6e525aacd6ab74735ff4ce389a9eead8`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626294 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` `9948b19c26eef90e5bbee8002646bbf7989a219751a5cd8a8294635fa172fc10`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 613 long base64-like blob(s).

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