Batch Processing a Find Font in Document

Here is the code I am working with.... can anyone offer any suggestions/help?

#target illustrator
var arialText = app.textFonts.getByName("ArialMT")
var arialBold = app.textFonts.getByName("Arial-BoldMT")
//Set up vairaibles
var sourceDoc, sourceFolder;
var count = 0;
// Select the source folder.
sourceFolder = Folder.selectDialog('Select the folder with Illustrator files...', '~');
destDoc = app.documents.add();
// If a valid folder is selected
if (sourceFolder != null) {
    files = new Array();
    // Get all files matching the pattern
    files = sourceFolder.getFiles();
    if (files.length > 0) {
        // Get the destination to save the files
        for (xx = 0; xx < files.length; xx++) {
sourceDoc = app.open(files[xx]); // returns the document object
            var allText = sourceDoc.textFrames; // Select All layers in Active Document
for (i = 0; i < allText.length; i++) {
var textFieldRange = allText.textRange;
var textProps = textFieldRange.characterAttributes;
var textFrameFont = textProps.textFont;
if (textFrameFont == "[TextFont ArialMT]" || textFrameFont == "[TextFont Arial-BoldMT]" || textFrameFont == "[TextFont Arial-BoldItalicMT]" || textFrameFont == "[TextFont Arial-ItalicMT]" || textFrameFont == "[TextFont ArialNarrow]" || textFrameFont == "[TextFont Arial-Black]"){ 
// font is correct
}
else if (textFrameFont == "[TextFont MonospaceBT]"){
// change the font to ArialMT which is Arial Regular
textFieldRange.characterAttributes.textFont = arialText;
count++
}
else{
// change the font to Arial Bold
textFieldRange.characterAttributes.textFont = arialBold;
count++;
}
}
sourceDoc.close(SaveOptions.SAVECHANGES);
}
}
}
// Alerts based on count
if (count == 0){
alert("YOU'RE GOOD TO GO!\nAll text in this document are a form of Arial!");
}
else {
alert("Complete!\n" + count + " textFrames were not a form of Arial.");
}

Are the PDF files created in Illustrator with “preserve Illustrator editing capabilities” checked when saving? If not, opening a generic PDF into Illustrator may be problematic (Illustrator is not a general purpose PDF editor).

Prepression: The Ten Commandments of PDF

I would recommend Enfocus PitStop Pro for Adobe Acrobat Pro or the stand alone hot folder based Enfocus PitStop Server for this task.

EDIT: Do you have some random sample files? Depending on how the text is composed, changing the font (in any software) could lead to unexpected results…

If you familiar to JavaScript, You can use ExtendScript do that.