hi
i scan my pc with Emsisoft find virus in avast directory in this path
C:\Program Files\AVAST Software\Avast\pdf.dll
i scan this file with VT Below link
Antivirus scan for f5f019feca54164921822dabeabb9a303ff9ff0224fca92488123c5c4e536099 at 2017-01-03 21:46:09 UTC - VirusTotal
i scan my pc with Emsisoft find virus in avast directory in this path
C:\Program Files\AVAST Software\Avast\pdf.dll
i scan this file with VT Below link
Antivirus scan for f5f019feca54164921822dabeabb9a303ff9ff0224fca92488123c5c4e536099 at 2017-01-03 21:46:09 UTC - VirusTotal