Malicious PDF — malware analysis report

Static analysis result for SHA-256 c740f33988186046…

MALICIOUS

PDF

1.9 KB First seen: 2026-05-11
MD5: d8c82727c87a9be127ce8b783fc0bef8 SHA-1: 92c20d1e2541e533e868c493ecf2c9c69ba66b57 SHA-256: c740f339881860462327d305607b7b01bf64aba06c8f3d1396fa61554e8d9b48
68 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier with high confidence as malicious. Static analysis identified an embedded file, which is a common technique for delivering secondary payloads. The embedded file itself was also flagged as suspicious. The document body content is not human-readable, suggesting it is primarily a container for the malicious artifact.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Suspicious extracted artifact medium 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 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
  • 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/ In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.4/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x55 15955 bytes
SHA-256: a4fc20ff6975247924ec357e1e8d117d68bcbd259437f91a02d57b8560456db7
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
xfa_image_rawvalue_000.tif pdf-xfa-image-tiff XFA image/rawValue TIFF payload near offset 0x60B 10414 bytes
SHA-256: 008942c5ec74b99eb47f6f8e8fa90e0c6bc133c63d19ad569da30f447c98d886
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: heap spray 0x41 (A)

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