Avast web shield - Infeccion Bloqueada

Hola, tengo la siguiente situacion : cada que entro a ver mi web (www.idhbolivia.org) avast me da una alerta de infeccion bloqueada. JS:Downloader-EDF
que me sugieren hacer ? ah la web es nuestra.

https://forum.avast.com/Volumes/Macintosh HD/Users/Imac03/Desktop/Cap 001.jpeg

Scan for: http://www.idhbolivia.org/
Hostname: www.idhbolivia.org
IP address: 198.1.80.107

System Details:
Running on: Apache

Web application details:
Application: Joomla! - Open Source Content Management - http://www.joomla.org

Web application version:
Joomla Version 2.5.6 found at: http://www.idhbolivia.org//administrator/manifests/files/joomla.xml
Joomla version outdated: Upgrade required.
Outdated Joomla Found: Joomla under 3.6.4

Domain blacklisted By Yandex (via Sophos): idhbolivia.org - reference

Blacklisted, browser difference and links to (possible) blacklisted site :
https://www.websicherheit.at/website-malware-viren-scanner/?url=www.idhbolivia.org

Malicious :
http://zulu.zscaler.com/submission/show/a47fea501d53700677ca91610ebba971-1487864208

Blacklisted :
http://www.urlvoid.com/scan/idhbolivia.org/
https://sitecheck.sucuri.net/results/www.idhbolivia.org
https://www.virustotal.com/en/url/1adc4609b2e86b09892ee7f7471102caedc18f28056519f9ffde2ccd79e6e91a/analysis/1487864226/

Blacklistings :
http://urlquery.net/report.php?id=1487863456190

Outdated Joomla version used.