Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b533dddb9df06e…

MALICIOUS

PDF

13.2 KB First seen: 2013-08-12
MD5: 7c06a6540c089dd23a41a23b59ead677 SHA-1: 1e2dfcaaaae8934a4a4498963bb0a13f8115c13d SHA-256: 10b533dddb9df06e3c62b14378c59edf9429b189fdd0e491c750bbae792df799
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains malformed active content and is flagged by an ML classifier as malicious. Embedded JavaScript, reconstructed from concatenated strings like 'bd="String.fromCharCode;"', is present and likely responsible for executing a secondary payload. The embedded file artifact further suggests a dropper or exploit delivery mechanism.

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/xci/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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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 0xD5 12790 bytes
SHA-256: 781076a0995f02086a6469937f25d37512fdbc4b6ef7a84ba13e10bf1283df0d

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