Malicious PDF — malware analysis report

Static analysis result for SHA-256 618dcff4f006b9ec…

MALICIOUS

PDF

10.4 KB
MD5: e626c10f9a1a754ebe769094926e5238 SHA-1: 79708dda83bd271558bb9eabef538fe79857e69f SHA-256: 618dcff4f006b9ec55035e78236997ea9a44969fb86759634320393491456c2a
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including ML classification and ClamAV detection for obfuscated objects. It contains an embedded file, which is a common technique for delivering secondary payloads. The XFA form structure also suggests potential for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
8a730a2ff8427174a6941fbdb76a307e485845924bf354b4b808e26b959efb86		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x8C 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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