If you do not have access to Solidworks, the easiest way how to convert EASM assembly files to PDF would be to download and installed the free eDrawings viewer and print the EASM file as PDF file.
Convert SolidWorks eDrawing assembly data to Adobe Portable document format.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert easm to pdf on Windows
A 2D and 3D CAD construction software
Convert from easm file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.