Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e6a5b6ac0df9b4…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 01d55e2b93b79e33e1741f8201481afd SHA-1: f7973182ca79d7488e02e133b496030a52052cd0 SHA-256: 72e6a5b6ac0df9b483fa982f4ffe0ecd7c15d31ab4f64830fb9c7ee08ec31875
110 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Agent-36874' and an ML classifier. The presence of XFA forms and AcroForm buttons with action triggers suggests an exploit is embedded within the PDF structure. The primary function appears to be exploiting a client execution vulnerability to likely download and run a secondary payload, consistent with a phishing attachment delivery method.

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
6942a0d23358f73526143eea5b1307dd6d4f367341734bc3472a61aebb5ef3a0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1400 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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