PDF malware analysis — malicious · b25088314c659482

MALICIOUS

PDF

15.7 KB

MD5: 9dda53bd6040d9bbc239fc0684d535f1 SHA-1: d7872fef2c927a2fa49bca8fd2560dcd4c5b8e9a SHA-256: b25088314c659482036c2acca0a8a5dda737de746752e81e0215e5ba19dd093b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, as indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL'. The presence of an 'eval()' call and the ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggest that this JavaScript is malicious and likely exploits a vulnerability within the PDF reader to execute arbitrary code. The extracted JavaScript files, 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js', further support this, although their specific actions are not detailed here.

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` `35bf8c07291170e343e5340a04878b918a05fdeac9c6d5fd68e8d28d9309b48c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425309 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` `ab342c88495cfb700515831afd8749cee5c1ce789a321d5a55f8c52cb5e9ae11`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 560 long base64-like blob(s).

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