Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a757dbf006f288d…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 9f1da320e11081448ec717db90defad7 SHA-1: 7906d2652c5cdaffd4dcf7ef422a529661579385 SHA-256: 4a757dbf006f288d5b7751352b011eb92599ba85678783e412a513767b4b12f8
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File

The file is identified as a malicious PDF by ML classification and ClamAV, specifically detected as Pdf.Exploit.Agent-36874. The presence of an XFA form and an AcroForm button with an action trigger suggests an exploit is embedded within the PDF structure. The ML classifier output of 0.999296 further strengthens the malicious classification. No scripts were extracted, but the PDF structure itself indicates a likely exploit delivery mechanism.

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
e0bb351014348a8f4cd1508b2432adad2bb8f35d706faaf495778305490d30e0
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1483 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).