You can save your workspace as a PDF file by first saving it as a MATLAB file using matlab.io.saveVariablesToScript or Simulink.saveVars functions. The MATLAB file generated can be converted to PDF file using the publish function which publishes a PDF file in a new directory named 'html' that is automatically created. For example:
matlab.io.saveVariablesToScript('myVars.m')
publish('myVars.m','pdf')
or
Simulink.saveVars('MyVars');
publish('MyVars.m','pdf')
Hope this helps!