Java Solution:

public static int designerPdfViewer(List<Integer> h, String word) {
    int maxHeight = 0;

    for (int i = 0; i < word.length(); i++) {
        int index = ((int) word.charAt(i)) - 97;
        if (maxHeight < h.get(index)) {
            maxHeight = h.get(index);
        }
    }

    return maxHeight * word.length();
}