PDF malware analysis — malicious · b332077d4dc1c6f2

MALICIOUS

PDF

118.6 KB

MD5: 9396e2c2cfe1b48f6c7cc4c99487e43e SHA-1: c9f3e2e76739bd51114a7360f6b5aba256819348 SHA-256: b332077d4dc1c6f2f22afb1228057e010d28b0c387dbe6cb91d8d95d54a54565

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager. Heuristics indicate the use of eval() and String.fromCharCode, suggesting obfuscated code execution. ClamAV detection confirms this as a malicious exploit PDF. The primary attack vector appears to be leveraging JavaScript within the PDF to trigger an exploit, likely downloading and executing a second-stage payload.

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` `5adc1744c70f4d621b860d43604ebb7bab087f066dd473de94aca2ff8771109f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627141 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` `97906a8e6d0b45e7b3e511e4bcfb8490ee3c09905aafceda68a8de32ddc24c2c`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262118 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 663 long base64-like blob(s).

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