This is a Google Apps Script that creates a PDF file using a Google Doc template and the values in a Google Spreadsheet. It is based on www.andrewroberts.net/2014/10/google-apps-script-create-pdf/ but allows placeholders to be used in the filename.

createPDF_filename.gs

// dev: andrewroberts.net

// Replace this with ID of your template document.
var TEMPLATE_ID = ''

// var TEMPLATE_ID = '1wtGEp27HNEVwImeh2as7bRNw-tO4HkwPGcAsTrSNTPc' // Demo template
// Demo script - http://bit.ly/createPDF
 
// You can specify a name for the new PDF file here, or leave empty to use the 
// name of the template. Placeholders can also be placed in here.
var PDF_FILE_NAME = ''

/**
 * Eventhandler for spreadsheet opening - add a menu.
 */

function onOpen() {

  SpreadsheetApp
    .getUi()
    .createMenu('Create PDF')
    .addItem('Create PDF', 'createPdf')
    .addToUi()

} // onOpen()

/**  
 * Take the fields from the active row in the active sheet
 * and, using a Google Doc template, create a PDF doc with these
 * fields replacing the keys in the template. The keys are identified
 * by having a % either side, e.g. %Name%.
 *
 * @return {Object} the completed PDF file
 */

function createPdf() {

  if (TEMPLATE_ID === '') {
    
    SpreadsheetApp.getUi().alert('TEMPLATE_ID needs to be defined in code.gs')
    return
  }

  // Set up the docs and the spreadsheet access
  
  var copyFile = DriveApp.getFileById(TEMPLATE_ID).makeCopy(),
      copyId = copyFile.getId(),
      copyDoc = DocumentApp.openById(copyId),
      copyBody = copyDoc.getActiveSection(),
      activeSheet = SpreadsheetApp.getActiveSheet(),
      numberOfColumns = activeSheet.getLastColumn(),
      activeRowIndex = activeSheet.getActiveRange().getRowIndex(),
      activeRow = activeSheet.getRange(activeRowIndex, 1, 1, numberOfColumns).getValues(),
      headerRow = activeSheet.getRange(1, 1, 1, numberOfColumns).getValues(),
      columnIndex = 0
 
  // Replace the keys with the spreadsheet values
 
  for (;columnIndex < headerRow[0].length; columnIndex++) {
    
    copyBody.replaceText('%' + headerRow[0][columnIndex] + '%', 
                         activeRow[0][columnIndex]) 
    
    PDF_FILE_NAME.replace('%' + headerRow[0][columnIndex] + '%', 
                         activeRow[0][columnIndex])
  }
  
  // Create the PDF file, rename it if required and delete the doc copy
    
  copyDoc.saveAndClose()

  var newFile = DriveApp.createFile(copyFile.getAs('application/pdf'))  

  if (PDF_FILE_NAME !== '') {
  
    newFile.setName(PDF_FILE_NAME)
  } 
  
  copyFile.setTrashed(true)
  
  SpreadsheetApp.getUi().alert('New PDF file created in the root of your Google Drive')
  
} // createPdf()