Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c53d31410945aae…

MALICIOUS

PDF

12.7 KB
MD5: e4b5b344f1dbf17d7d4f81c6ba77f238 SHA-1: 619d2e7cc39953654f68d80a32561b8d5a8a9693 SHA-256: 9c53d31410945aae9dbe841b9ef3a070a661aadbe926dfad3b0cc6c649829e45
228 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.001 Phishing: Spearphishing Attachment

This PDF document contains XFA (XML Forms Architecture) which is known to be susceptible to heap spray exploits. Critical heuristics indicate the presence of XFA heap spray exploit code and risky executable script within the XFA form. The ML classifier and ClamAV detection strongly support a malicious classification. The embedded file and script payload suggest the document is designed to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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
9d48842cde9e2af32b5a3d9ce35e5a5dbff31a829ee4b9a78c39a87c8bf59625		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12261 bytes

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