PDF malware analysis — malicious · 3be5bb3bf6683fb1

MALICIOUS

PDF

118.6 KB

MD5: 5ffa4a821cfea1faa54d51bd561c347d SHA-1: 7a4ccfbf7a58b0786889394070ea83777855b116 SHA-256: 3be5bb3bf6683fb1a579dfa8668d2c7fbfc8f5f0d2c1e10e15893aa6c90dd711

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1059.007 JavaScript/JScript

The PDF contains embedded JavaScript, with heuristics indicating the use of eval() and String.fromCharCode, suggesting code obfuscation and execution. A critical ClamAV detection of 'Pdf.Exploit.Agent-36086' strongly indicates malicious intent, likely involving an exploit or a stager for further payload delivery. The presence of large, deobfuscated JavaScript streams further supports this. No specific URLs or network indicators were extracted, limiting the IOCs to the ClamAV signature.

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` `73f1d44e76516db52b9d3a1002a467a9c9895f3e658e2c164d3eec0d7aef709a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626528 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` `435de18ab4b63bf90054ea5437f53092ca59cd6158639129df4bee9c6514d141`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 603 long base64-like blob(s).

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