Excel Sheet with Ole PDF Object

I have a lot of excel files where in the first sheet there is a simple table and in the second sheet there is a pdf file as a ole object (not only by reference).
When I open a file with any version of Ms excel I don’t have any problem, but if I open the same file on the same computer with libre office the ole object are displayed only as icon (like in excel) but when I double click on it are not open (in excel when I do it the PDF file are open with acrobat reader).
It seems Calc don’t recognize the ole object like a pdf object but only like an image object.
I have check under preferences → load/save → and all the check’s are ok any Idea ? (for me is out of discussion import manually the pdf file in Calc because I have approx 5000 files…)
Thank you in advance for your answers