Researchers from Ruhr-University Bochum have disclosed two new attack techniques, dubbed Evil Annotation and Sneaky Signature attacks, on certified PDF documents that could potentially allow attackers to modify visible content without invalidating their digital signature. The attacks are documented in  CVE-2020-35931 ,  CVE-2021-28545 , and  CVE-2021-28546 . The experts presented the results of the study at the 42nd […]