Get file from server

Hello!

Please help me to solve the problem:

I need to get a file from the server. I only have a reference to the service, the data that will come are as follows:

{"output": "PD94bWwgdmVyc2lvbj0iMS4wIiBlb"}

... And it comes JSON, with binary code inside.

Tell me, please, is there a SAPUI5 methods to convert the binary string to the finished file, which can then be saved on the client computer?

Or is there some other way to get a file that is dynamically created on the server?