Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f23f228206a4093…

MALICIOUS

PDF

13.2 KB First seen: 2013-08-20
MD5: 263551f7b68c8c5a05a4954ad60f6fdc SHA-1: d8c4c8ffdcf240580529bba998162b27ffdbe116 SHA-256: 0f23f228206a4093a39224a5a3b7249d41960bd92b3df2ee4a94c5a944820b14
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains malformed active content streams and embedded script payloads, indicating an attempt to exploit vulnerabilities. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript is likely designed to download and execute a second-stage payload, although the exact script content is obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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
  • Embedded script payload in PDF stream info 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 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/xdp/ In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 12839 bytes
SHA-256: 5afa2c2f705ca26ff7ec3560b68c15441bfa7f25bf527cd845e2fff1cc4d64f6

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