Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7749ebcbf981ac…

MALICIOUS

PDF

19.2 KB
MD5: 3dbbd28732897daaa4b128eb36371d51 SHA-1: f1e20dbea2e1f4505ff289610668cddfed530cca SHA-256: 0e7749ebcbf981acace2f5f57b11ee5fb3c5ab4763984342fcfb6581c18c9963
118 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating an embedded script payload and an embedded file. The presence of XFA forms and embedded scripts suggests an exploit is likely being used to execute arbitrary code. While the specific exploit is not detailed, the overall pattern points to a malicious document designed to deliver a secondary payload, likely via spearphishing.

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 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 script payload in PDF stream low 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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
6dce41367c723f77ae56b11b0a6283342c9b10f739a459fb06eb00c0ba8a154a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18932 bytes

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