PDF malware analysis — malicious · ff686d6f34dbdb1b

MALICIOUS

PDF

12.4 KB Created: 2010-02-12 22:33:28 Authoring application: Thcevzapedehna First seen: 2026-05-10

MD5: 6a5f739c921fd78f6e6bedce1cd6b6d7 SHA-1: ff0bff73f5c4aebad662fb5bac9e41ad1dcf2f21 SHA-256: ff686d6f34dbdb1b7a4e7331649be8e4738c477274b9bf86a53f10c12c045304

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests the JavaScript is obfuscated, and a suspicious extracted artifact named 'javascript_obj0018_000.js' was found. This JavaScript is likely designed to download and execute a second-stage payload from a remote source, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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
```
    s=s.replace(/Z/g, '%');
 app.alert(unescape(s));
```
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js`	pdf-javascript-stream	PDF /JS object 18 at offset 0x2D6E	290 bytes
SHA-256: `3da2b6c1454d97f140e82da5968c0d6d868ed2e92bc0c016e9fdfc313697a027`
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 var s=''; var l=this.getPageNumWords(0); for(var i=0; i < l; i++) { s+=this.getPageNthWord(0,i) + ' '; } s=s.replace(/Z/g, '%'); app.alert(unescape(s)); // app.alert(this.info.title); // var obj=this.doc; // for(var i in obj) s+=i+' = ' + obj[i]+"\n"; // app.alert(s);

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