Most of PaleoJudaica's coverage of Malta's history has involved Phoenician archaeology. But there are Jewish remains from at least late antiquity on. I didn't know that Abraham Abulafia did some of his late work on the island of Comino.
The evidence for a supposed Jewish presence at Gozo in the ninth century BCE is a dubious inscription found in 1912 in the Neolithic Ġgantija temple complex. I can't find a photo of the inscription or any specialist coverage. There are various claims and counter-claims about it online. The dating doesn't correspond to the Neolithic context. Granted, it could be a later graffito, but as it stands now, I am skeptical. If I can find out more, I will get back to you.
As I said, Malta has made many contributions to Phoenician and Punic archaeology. See the archives for details. Soem specific stories are here, here, here, here, here, here, here, and lots of links.
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