Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f99385492ef3e1…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 6cb847a72012587fcf1a51bf98db2bdd SHA-1: aca514c5992595a10c9ea5d604c7a3a1617663ee SHA-256: 42f99385492ef3e1e43badb1d535df8a9d1b2d0a545ae0350bd15bb4d8cc00a3
78 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36874, indicating a known PDF exploit. The presence of an XFA form and an AcroForm button with an action trigger further suggests an attempt to leverage PDF vulnerabilities. The extracted document body contains obfuscated text, which is common in exploit documents designed to hide malicious content. The overall pattern points to a malicious PDF designed to exploit a viewer vulnerability.

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
328ea015e446d291006eb40001aed487c067d3f92a0d96d983306a6992c0a964
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1504 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).