Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ff56cad9701989…

MALICIOUS

PDF

5.4 KB Created: 2011-04-05 23:46:28 Authoring application: bfdfub lodsab
MD5: 50be359e3953375813b45b3b4923a185 SHA-1: ad6b7116686812c5e06bd9d2b0def7937fb7c4f0 SHA-256: 44ff56cad97019891624f7b34ac2613c436e61a41719f793b0001e8d19a3d718
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT heuristics. The embedded script, named 'stream_001_off00000343.js', is likely responsible for downloading and executing a secondary payload. The PDF_UNESCAPE heuristic suggests obfuscation techniques were used within the script. The file's metadata and heuristics point towards a malicious intent, likely for delivering further malware.

Heuristics 6

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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_off00000343.js
d0aa38efbf595eb9cba1e3d4da26e0ace45a2e0e3e558adbb0abea8658a564e7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x343 56469 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).