Find and remove multiple pdf files from reference

Dear Sir/Madam,

I notice a problem in few of my references, they have 8-10 pdf file attached. All are same. They attached while syn,import etc from various sources (desktop, online). 

Any possibility to shortlist these references and remove multiple pdf files? 

Kind Regards.

I have noticed this too, I was able to fix it by logging in to my Endnote Web account and deleting the duplicate attachments from there.