Re for the alert: https://urlquery.net/report/3d89b1c8-ed69-4085-803d-2ee9e86cc004
All green given here: https://www.virustotal.com/nl/url/a3fb796a3ce8e82350c6151b2dbc3a345b9c150143a736547c78a2e2738c8f59/analysis/1535908233/ and here: https://sitecheck.sucuri.net/results/www.broekhuisjuweliers.nl#
iFrames (non-malicious) flagged here: http://www.isithacked.com/check/www.broekhuisjuweliers.nl
For the code → https://aw-snap.info/file-viewer/?protocol=not-secure&ref_sel=GSP2&ua_sel=ff&chk-cache=&fs=1&tgt=d3d3LmJ9XXtraHVbc2p1d3tsW3t9cy5ubA%3D%3D~enc
polonus (volunteer website security analyst and website error-hunter)