How can I make sure whether a job offer is genuine or scam in Dubai?

Hi,

I received a job offer in Dubai as an electrical/instrumentation supervisor but I'm just a bit confused for two reasons:

1) The starting monthly salary is AED 93,500.00 plus other benefits of AED 12,000.00

2) The company asked me to pay for the visa and for the work permit in the UAE (the site seems original and genuine..).

The sum would be repaid at the beginning of the work in Dubai.

This is strange because I have never advanced money for a visa in my passport and for a work permit when I worked abroad out of Italy I suppose this is a fake job offer.

Thanks and regards

G.