Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3771efc3d4553d5…

MALICIOUS

PDF

12.2 KB
MD5: 3eeb49e213ae28ee0d9ae87c12e977b0 SHA-1: 38185fc8990e4be10805525f52f030e3897ff85a SHA-256: e3771efc3d4553d5db186505e7ef9c6e596270ad3ba3c590bf355e3f7f3235cb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The sample is a PDF document identified as malicious by ClamAV (Pdf.Exploit.Dropped-78). It contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Specifically, the PDF_XFA_HEAP_SPRAY heuristic indicates the presence of exploit code designed to spray the heap, likely to facilitate code execution. The PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT heuristics further confirm the presence of risky executable script within the XFA form. While no specific second-stage payload URL was extracted, the presence of these exploit indicators strongly suggests the document is designed to deliver and execute malicious code upon opening.

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • 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
  • 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
49eb5f4aa123a6003c1690d8ef6da9922a9055107d7ec7cb52d675985909899c		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11778 bytes

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