Intercept files uploaded to my HTTPS site to sent them to an AV

I have a website where different providers upload files pdf, words, etc... I would like a way to intercept those files even if is done in parallel and send them to an AV engine to be scanned.

The files are store in a SAP database and the specific AV that integrates with SAP API (Netweaver) is quite expensive therefore I'm asking for this alternative to intercept the files uploaded.

Is there a way commercial or custom to do this?

Thanks in advance