Malicious PDF — malware analysis report

Static analysis result for SHA-256 158883f5e00914d7…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: cd647b4bbd923a36d5c15f9aaaa12648 SHA-1: 2ad9fc4dd0984789e99a348c311d40e672ab3bc7 SHA-256: 158883f5e00914d786c14a8362d5dcf06fac3dee9671742baaefbf4571290ddd
110 Risk Score

Malware Insights

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

The critical ClamAV detection and ML classifier firing strongly indicate this PDF is malicious, exploiting a known vulnerability. The presence of XFA form elements and an AcroForm button with an action trigger are common indicators of PDF exploits. While no specific payload or C2 infrastructure was directly extracted, the exploit's nature suggests it's designed to download and execute a secondary stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-36874 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36874
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off000008ed.bin
ea47cef7f4dfe0012e93ff9d1936dcf4a4fce897ace2859feb331a3e19c9f5df		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1435 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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