We have a new client, and they submit us a pdf with the logo of their company, to use, for the future (WTF?!) and when I tried to know if they have the name of the font used, they said "Dunno!" so, please, someone can help me, before I start to get crazy?
Thank you guys

Helvetica Neue 55 Roman  Suggested by henriavecunk 

You might also open the pdf in Illustrator and just extract the logo (if it's outlined like logos always should be).

Right! Let me try it. Thank you so much for the suggestion.