Malicious PDF — malware analysis report

Static analysis result for SHA-256 456aca67dcaeab7f…

MALICIOUS

PDF

87.7 KB
MD5: 5ce2df2e6eb1ad2a7badb325d0547ae4 SHA-1: 766911f0be3db0a0bd54ec07bfc57d6456b9a87a SHA-256: 456aca67dcaeab7f527f3c32eabccb4665ae0e4f887ed775063d6f6c8fda8c03
212 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.001 PowerShell

The critical PDF_XFA_HEAP_SPRAY heuristic indicates the presence of exploit code targeting XFA forms. This is further supported by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT firings, suggesting the embedded script is malicious. The embedded script likely attempts to download and execute a second-stage payload, a common technique for PDF-based malware delivery. The ClamAV detection confirms the malicious nature of the file.

Heuristics 9

  • 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.
  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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.
  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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_pdf_script_0000044d.bin
c4fb733365bb18682099066dc0435aef08f4cd3d63abdcb6c20102c19acb138a		 pdf-embedded-script PDF raw stream script payload at offset 0x44D 88689 bytes

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