PDF malware analysis — malicious · 97cc0b334a1631d8

MALICIOUS

PDF

15.7 KB

MD5: 3d465e89fac9044d02a3a33d27bed20f SHA-1: 19fcf242adf8580bfb2a1049058456c042d98249 SHA-256: 97cc0b334a1631d851410ee1cb33710b4d593cf3d2eb729c3e08f4ee978c200b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL'. The presence of 'PDF_EVAL' and 'PDF_FROMCHARCODE' suggests obfuscated code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' confirms malicious intent. The embedded JavaScript streams, identified as 'javascript_obj0006_000.js' and 'legacy_pdfkit_stage_000.js', are likely responsible for exploiting a PDF vulnerability to download and execute a secondary payload, although the exact mechanism is obscured.

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` `b74b45e5a57f0e40052bc31ad86aed3ae06a9fd84793e44f1b0049c52bf69beb`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425352 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` `3dc35b75ffc801db826139e3bb3b2c53d0896bd7a19c93bfd5bcb06fc215212a`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 426 long base64-like blob(s).

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