What CAB files are Supported/Non-Supported by MetaDefender’s Deep CDR?

1. Microsoft Cabinet, Signature: MSCF

• Cabinet (or CAB) is a Microsoft Windows archive-file format that supports lossless data compression and embedded digital certificates that are used for maintaining archive integrity.
• Cabinet files have .cab filename extensions.
• Cabinet files are recognized by their first 4 bytes: MSCF.
• Cabinet* files were originally known as Diamond files.

2. InstallShield Cabinet, Signature: ISC

• InstallShield CAB files are also archive files, but they are used by the installer program, InstallShield for its own proprietary archiving formats. Hence, they are distinct from Microsoft Cabinet files.
• InstallShield CAB files also have .cab file name extensions.
• InstallShield CAB file headers are not the same as Microsoft CAB files, so they are incompatible and cannot be manipulated or edited with the programs that are made to interact with the standard Cabinet format - including MetaDefender Core’s Deep CDR.
• There are actually numerous other (Non-Microsoft) installers that use the .cab extension for their proprietary archiving formats, but InstallShield CAB files are the most common.
• InstallShield CAB* files are recognized by their first 3 bytes: ISC.