Cassandra DB: store binary file record via shell
The only way to do it with cqlsh is wrap binary file into CSV file and run cqlsh --some_args -e 'COPY table_name FROM binary_wrapped.csv', but in order to do so you have to generate a new primary key to use in CSV-file.

IMO: Since cqlsh is a wrapper around python client, your ops should just write simple python script for this operation, it would be much easier in many ways.