Malicious PDF — malware analysis report

Static analysis result for SHA-256 d561866759dcca5d…

MALICIOUS

PDF

13.4 KB First seen: 2013-08-09
MD5: 7e37d84c0cacecd134c057234140bd15 SHA-1: 51bfd1f5f63ab78eb3196876381dc86178c32d09 SHA-256: d561866759dcca5d0bff6c6cf29190f3077834d6b2d29184ec682c0e72ddc7d0
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains an embedded script payload, indicating an attempt to exploit vulnerabilities within the PDF reader. The presence of an embedded file further suggests the inclusion of a secondary malicious component. While the document body is heavily obfuscated and unreadable, the heuristics point towards a malicious script being embedded, likely for the purpose of downloading and executing a second-stage payload. The embedded URLs are related to XFA forms, which have been historically exploited.

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 13032 bytes
SHA-256: c9faad37f7dbbea4b24d4d2e850c55057a17279682c79709cad8572cbd6ae493

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