Salut ! Hello!
All of the original birth, marriage, and death records for Saint-Malo are available for free and online at the website of the Archives départementales d'Ille-et-Vilaine. Here is a direct link to the website:
http://archives.ille-et-vilaine.fr/thot,67604,fr.htmlOf course, records after 1793 are indexed in Ten-Year Indexes (Tables décennales), which will make your search go more quickly.
You should have much success.
Bonne quête !