See here for Conditions to Enter Malta.
If you need a Visa click on this How to Apply link.
To check whether you need a VISA access the link on the Schengen Visa Info site.
You should also consult the following
Identity Malta - Visas
Ministry for Home Affairs and National Security - Schengen
You can also send an Email
PLEASE THINK EARLY. IT WILL NOT BE POSSIBLE TO OBTAIN A VISA AT SHORT NOTICE. AT LEAST A MONTH IS REQUIRED TO OBTAIN A VISA.
IF YOU REQUIRE A LETTER OF INVITATION TO OBTAIN YOUR VISA, PLEASE CONTACT US BY EMAIL. THIS WILL ONLY BE SENT IF YOU HAVE PAID THE RELEVANT CONFERENCE REGISTRATION FEES.