Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b845f29bf8ace31…

MALICIOUS

PDF

10.4 KB
MD5: 0e6b4ac127481ea8dcd3688ec306f248 SHA-1: e8d68c9add1aaf90fa3470b626a7a72d5883a92f SHA-256: 5b845f29bf8ace311b16a4f42f59803c9d197e64b37f2e073d852482eb2e931a
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious by a machine learning classifier and ClamAV due to obfuscated objects and XFA form usage. An embedded file was also extracted, suggesting it's used to deliver a secondary payload. While no specific script content was readable, the presence of XFA forms often implies JavaScript execution for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
55ebfd2e1e796aa9eea720550e1087d02bb28ac6111ef11e05cbf10e32163316		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x84 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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