Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f939e5ef40edbc6…

MALICIOUS

PDF

1.14 MB Created: 2010-05-15 02:25:14 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: 831723668632bb054807a441247ca43d SHA-1: f426dab37d196f4fb638a247e94971ec6a88e86c SHA-256: 9f939e5ef40edbc6ee3a904a083fe96a299f983e37f94dad8cc8c53273ed5972
102 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file exhibits high-severity heuristic firings for PDF_EVAL and PDF_UNESCAPE, indicating the presence of obfuscated JavaScript. This embedded script payload is designed to exploit PDF vulnerabilities, likely for the purpose of downloading and executing a second-stage payload from a remote source. The embedded URL http://www.iec.ch is present but confirmed benign, suggesting it may be a decoy or unrelated.

Heuristics 5

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://www.iec.ch

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000bf61.bin
a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBF61 264072 bytes
embedded_pdf_script_0012191b.bin
7dc55dbac61955370f15809e2166143c9968d3fb27ab616a65a536aca56b15ca		 pdf-embedded-script PDF decompressed stream script payload at offset 0x12191B 1192461 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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