### Impact
If pdf.js is used to load a malicious PDF, and PDF.js is configured with `isEvalSupported` set to `true` (which is the default value), unrestricted attacker-controlled JavaScript will be executed in the context of the hosting domain.
### Patches
The patch removes the use of `eval`:
https://github.com/mozilla/pdf.js/pull/18015
### Workarounds
Set the option `isEvalSupported` to `false`. 
### References
https://bugzilla.mozilla.org/show_bug.cgi?id=1893645
Fix available through Seal Security. No upgrade required, protect your application instantly.
Fix without upgrading