It sounds like you're referring to a specific beta or version number (v243042435) of Adobe Acrobat Reader with an "Edit PDF" feature. Since that version number doesn't match official public releases (likely a typo or internal build), I'll assume you're looking for a for Adobe Acrobat Reader's Edit PDF mode (which is typically only fully available in Acrobat Pro, but limited in the free Reader).
Generally opens files quickly and handles smooth scrolling on modern hardware. adobe acrobat reader edit pdf v243042435 bet new