Malicious PDF — malware analysis report

Static analysis result for SHA-256 f686f87a792b79b5…

MALICIOUS

PDF

12.7 KB
MD5: f0a0bcc1d3408b574a9d236c3f5917ad SHA-1: f863c06e3dd20d3a484476d93b22db0ef4a3f395 SHA-256: f686f87a792b79b543e815de0a91947fa929aba8005c0f2888eb7d1c36429254
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.007 JavaScript/VBScript

The PDF document contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Critical heuristics indicate a PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT, suggesting the document attempts to execute malicious JavaScript. This script likely aims to download and execute a second-stage payload, as indicated by the embedded file artifact and the ML classifier's high confidence score. The ClamAV detection further confirms its malicious nature.

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
926ac25c648056ced27bce2cfa21ef295b2e6b11cfc7f1cec83f21e54135804d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12259 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.