Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6039ab720617691…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: bd1cf00506548db35e2a74e196951e23 SHA-1: 849ba4f1470378e6926c5319059ed77f7e57623d SHA-256: f6039ab720617691ce45eda6f4e4dbd8ede828e488cdbcba6302eb70d92c2886
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The critical ClamAV detection and high ML classifier score strongly indicate malicious intent. The PDF contains XFA form elements and an AcroForm button with an action trigger, common vectors for exploit delivery. While the document body is heavily obfuscated, the presence of these exploit-enabling features suggests the PDF is designed to trigger a vulnerability and download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off000008ed.bin
3435611ca2695c2e1cfefc30c8c60ff6f1a3243b01f71f613e1a67a12ca0a2c7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1464 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).