Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fdcc1bfbb22ab4…

MALICIOUS

PDF

11.7 KB
MD5: 033cb777d43e6f6321d9761b52e86f4b SHA-1: a589e8eb5e6ec76f2a9200a8fa9a16d46d9b9570 SHA-256: a1fdcc1bfbb22ab408874f65fbf3c09bd61cc65580b32a51d078e26b4e36f27d
128 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML classifier score, indicating malicious intent. It contains an embedded script payload and an embedded file, suggesting it's a dropper. The presence of XFA form elements and embedded files points to a common PDF exploit delivery mechanism.

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
10a126a9e4a9da47e87fd307a2dfe18ad756355c26213d8bc85c420ec755f6d9		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11173 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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