The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently, a Signature Wrapping vulnerability exists in multiple products. An attacker can use /ByteRange and xref manipulations that are not detected by the signature-validation logic. This affects Foxit Reader before 9.4 and PhantomPDF before 8.3.9 and 9.x before 9.4. It also affects eXpert PDF 12 Ultimate, Expert PDF Reader, Nitro Pro, Nitro Reader, PDF Architect 6, PDF Editor 6 Pro, PDF Experte 9 Ultimate, PDFelement6 Pro, PDF Studio Viewer 2018, PDF Studio Pro, PDF-XChange Editor and Viewer, Perfect PDF 10 Premium, Perfect PDF Reader, Soda PDF, and Soda PDF Desktop.
Tracker PDF-XChange Editor before 8.0.330.0 has an NTLM SSO hash theft vulnerability using crafted FDF or XFDF files (a related issue to CVE-2018-4993). For example, an NTLM hash is sent for a link to \\192.168.0.2\C$\file.pdf without user interaction.
PDF-XChange Editor through 7.0.326.1 allows remote attackers to cause a denial of service (resource consumption) via a crafted x:xmpmeta structure, a related issue to CVE-2003-1564.