bitrix. Get file info

file.info.php

<?php
function formatBytes($bytes, $precision = 2)
{
    $base = log($bytes, 1024);
    $suffixes = array('', 'Кбайт', 'Мбайт', 'Гбайт', 'Тбайт');

    return round(pow(1024, $base - floor($base)), $precision) .' '. $suffixes[floor($base)];
}

if(is_numeric($aProps['cr_pdf']['VALUE'])){
    $rFile = CFile::GetByID($aProps['cr_pdf']['VALUE']);
    $aFile = $rFile->Fetch();
    if($aFile){?>
        <a  download="<?=$aFile['ORIGINAL_NAME']?>" 
            href="<?=CFile::GetPath($aProps['cr_pdf']['VALUE'])?>"
        >скачать <?=formatBytes($aFile['FILE_SIZE'])?></a><?
    } 
}