CorelDraw supports import of documents from Microsoft Publisher (.pub) and can open them, so there is nothing more easier than to save them as CDR images. Some users report that the import process is not 100% perfect, but of reasonable quality. As far as we know, there is really no other alternatives to CorelDraw for pub to cdr conversion.
Convert Microsoft Publisher document to CorelDRAW vector or bitmap graphics.
We found one software available in the database for this conversion.
Microsoft Windows software - convert pub to cdr on Windows
A set of applications used by professional graphic designers
Convert from pub 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.