Gotta at least have a name bro lol. Without a name what do you want us to do?

But if you don't have that, you will want to find some movie clubs in Maltese and ask around there. You can also try to find some Maltese movie groups too. One thing I've found is that there's always a group interested in everything. Vintage vacuums? Yeah, there are people that deal in just them and likely know every vacuum made between 1920 and 1960. You just have to find them.

When you have the name, find out who their distributers were or find out what studio produced it. Then reach out to them.

Sadly most go bankrupt so the originals are lost or even destroyed. There are plenty of indie films with some decently big names that end up this way too (I've been trying to find a decent copy of "Live Free or Die 2006" since it was released but sadly that movie looks to have evaporated despite having some huge names attached).

"Obscure Maltese movie" is ridiculously generic and impossible to identify anything from. Perhaps if you supplied some context of the movie, the plot or something?

Try searching it on https://btdig.com/, a DHT search engine. Most of the torrents there are very old and have barely any seeds. Be patient. The last thing I downloaded from there took 1-2 weeks to complete.

Try YouTube. I've been able to find tons of obscure movies on YouTube, blissfully unperturbed by any DMCA takedowns.