Malicious PDF — malware analysis report

Static analysis result for SHA-256 799fbb7ddc9ebde0…

MALICIOUS

PDF

11.7 KB
MD5: c81ba0db41c92a7fdb5e816231292ef4 SHA-1: cfa0482ec70789b425946cf1b7a43811ae1775eb SHA-256: 799fbb7ddc9ebde09ca2ec6d0fcc5e385faca5d016da41e2bd7962f89e817725
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML classification and ClamAV detection as 'Pdf.Exploit.Dropped-78'. It contains an embedded script payload and an embedded file, indicating it is designed to drop and execute further malicious content. The presence of XFA form elements and embedded files are common delivery mechanisms for PDF-based exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
87bfdae504958b45c589d158b1f24b6a5f8a136d593d9d6a8a3f71e90930cb92		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11268 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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