Adobe Reader 19.012.20034 CPU hang

Lately (in the last 1-2 weeks) we have been getting CPU alerts on Windows RDS servers (until now W2K16).

Upon inspecting we find a number of AcroRd32.exe processes (typical 1-4) using a full CPU (fx 25% in a 4 CPU server).

Looking at CPU Time we find those processes to be top consumers, yesterday a process had used 4h30m of CPU time when we got the alert, see below.

When asking users, they seem to have a PDF open in IE but nothing out of the ordinary.

When we kill the AcroRd32.exe process IE report a crash and the tab that have Adobe Reader loaded closes.

I made a Process Dump and loaded into WinDbg and got this - none the wiser but maybe you know what to do with it:

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Loading Dump File

User Mini Dump File with Full Memory: Only application data is available

WARNING: Minidump contains unknown stream type 0x15

WARNING: Minidump contains unknown stream type 0x16

Symbol search path is: symsrv*symsrv.dll*C:\Debuggers\DbgTools\sym*http://msdl.microsoft.com/download/symbols

Executable search path is:

Windows 7 Version 14393 MP (4 procs) Free x64

Product: Server, suite: TerminalServer DataCenter

Machine Name:

Debug session time: Thu May 23 17:14:31.000 2019 (UTC + 2:00)

System Uptime: 0 days 13:03:07.719

Process Uptime: 0 days 5:07:08.000

............................................................

wow64win!ZwUserGetMessage+0x14:

0:000> ~*kc

.  0  Id: ac7c.963c Suspend: 0 Teb: 00000000`0081d000 Unfrozen

Call Site

wow64win!ZwUserGetMessage

wow64win!whNtUserGetMessage

wow64!Wow64SystemServiceEx

wow64cpu!TurboDispatchJumpAddressEnd

wow64!RunCpuSimulation

wow64!Wow64LdrpInitialize

ntdll!LdrpInitializeProcess

ntdll!_LdrpInitialize

ntdll!LdrInitializeThunk

   1  Id: ac7c.ceb8 Suspend: 0 Teb: 00000000`00823000 Unfrozen

Call Site

wow64cpu!CpupSyscallStub

wow64cpu!WaitForMultipleObjects32

wow64!RunCpuSimulation

wow64!Wow64LdrpInitialize

ntdll!_LdrpInitialize

ntdll!LdrInitializeThunk

   2  Id: ac7c.7d68 Suspend: 0 Teb: 00000000`00826000 Unfrozen

Call Site

wow64cpu!CpupSyscallStub

wow64cpu!WaitForMultipleObjects32

wow64!RunCpuSimulation

wow64!Wow64LdrpInitialize

ntdll!_LdrpInitialize

ntdll!LdrInitializeThunk

   3  Id: ac7c.c9dc Suspend: 0 Teb: 00000000`00829000 Unfrozen

Call Site

wow64cpu!CpupSyscallStub

wow64cpu!WaitForMultipleObjects32

wow64!RunCpuSimulation

wow64!Wow64LdrpInitialize

ntdll!_LdrpInitialize

ntdll!LdrInitializeThunk

   4  Id: ac7c.b8a4 Suspend: 0 Teb: 00000000`0082c000 Unfrozen

Call Site

wow64cpu!CpupSyscallStub

wow64cpu!DeviceIoctlFileFault

wow64!RunCpuSimulation

wow64!Wow64LdrpInitialize

ntdll!_LdrpInitialize

ntdll!LdrInitializeThunk

0:000> .logclose

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The above process had used 4h:30m of CPU time.

Anyone else experience these problems - or anyone know how to troubleshoot it?

Any help will be highly appreciated.

/Nicolaj