we are 2 people travelling austria between 8-15 of july 2022, we will be visiting vienna,hallstat,salzburg, saalbach,and tirol.
we were wondering if the eurail 1 month pass is good for those destinations and is it valid for all bus/train companies
*we might be using transport for only 3-4 days
Depends on how many trips you intend to make-but as you say 1 month I would suggest looking into the REGIonal offers that are often much cheaper and do allow all normal transit IN that region only-on some weekends its even cheaper (f.e. dayticket for either Steiermark or Kärnten for just 11€).
Prebook longer trips-likely you will also have prebooked HTLs etc. for lower advance price.
In holiday areas many HTLs give out free local buspasses to their guests
Valid on trains yes but not on Buses 
maybe you buy a flexipass with 4traveldays in a month 
or a OneCountryPass Austria or the European EastPass which work out cheaper for you.
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