Malicious PDF — malware analysis report

Static analysis result for SHA-256 059c21489bce2de8…

MALICIOUS

PDF

10.4 KB
MD5: 96d858f38d67d8e9402b7815a44f70f5 SHA-1: 93d9e76640554374634f65b9d0859dca13659a8b SHA-256: 059c21489bce2de8c2c1a4207436625616ca26f9dc020eb91e4f655a1391029f
110 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains an embedded file and uses XFA forms, suggesting an exploit is likely present. The primary attack pattern involves exploiting a PDF vulnerability to execute a secondary payload, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
3bf92b4e033d46907788b129cd26c8ffd9f6950dacf86d7c1161058edc7bb14d		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x88 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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