Are "tecnick.com" libraries in Piwik safe/authentic?

Hi. Are these legitimate entries by Piwik?

1-{REX}PHP.hexencoded.longstring.1: /home/excelle2/public_html/ExpectPerfection.com/analytics/libs/Zend/Mime.php
2-{REX}PHP.hexencoded.longstring.1: /home/excelle2/public_html/ExpectPerfection.com/analytics/vendor/tecnick.com/tcpdf/include/tcpdf_static.php
3-{REX}PHP.hexencoded.longstring.1: /home/excelle2/public_html/ExpectPerfection.com/analytics/vendor/tecnick.com/tcpdf/tcpdf.php
4-{REX}PHP.hexencoded.longstring.1: /home/excelle2/public_html/ExpectPerfection.com/analytics/vendor/tecnickcom/tcpdf/include/tcpdf_static.php
5-{REX}PHP.hexencoded.longstring.1: /home/excelle2/public_html/ExpectPerfection.com/analytics/vendor/tecnickcom/tcpdf/tcpdf.php

I wasn’t able to find anything about it when searching the support site, generally online, nor on the forum, about the above. My security scanner marked these five things as malware; just wondering if it’s a false positive?

If not, what is it used for, please?

Thank you.