Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca1780875b0b78c…

MALICIOUS

PDF

13.1 KB First seen: 2013-08-26
MD5: 77a42c9baa9f3fdb6accbe7c3a50509d SHA-1: b2bb091b44acae01523d6b796ba4645ba142ea11 SHA-256: aca1780875b0b78cbd83c25334959f79c2f9c3265f7da937109aaecaea8f27c6
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded script content and an embedded file, indicating an attempt to deliver a malicious payload. The heuristics suggest the presence of an embedded script payload and an embedded file, which are common techniques for exploiting PDF vulnerabilities. The embedded script, though partially obfuscated, appears to be constructing a URL from concatenated strings, likely for downloading a second-stage payload. The presence of XFA form elements also points to potential exploitability.

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 12682 bytes
SHA-256: 2d595e9a5184f5140f749a5c5bd32890aaa4c5a43e892451267d10a5a6487fe9

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