Malicious PDF — malware analysis report

Static analysis result for SHA-256 0073b2ab23090b9f…

MALICIOUS

PDF

8.0 KB Created: 2008-08-19 12:14:36 Authoring application: avast5AG
MD5: a590f9606c00f49351cdd975c5285060 SHA-1: 0548cd94fd0a423a77eed9bac54e5c42f9033074 SHA-256: 0073b2ab23090b9f75d74ef31156492484f9e34a4505468d8e0006eff1705e35
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.002 Phishing: Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains an embedded file, identified as a suspicious artifact by static triage. The ML classifier strongly indicates maliciousness, and the embedded file is likely a secondary payload. The presence of XFA forms and embedded scripts further supports a malicious intent to execute code or download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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
  • 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/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x21C 84 bytes
embedded_file_obj0009.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x2CD 228 bytes
embedded_file_obj0010.bin
d734ef2caf82a8302ddd0da491141758563ffaddbddddd4f2431739c93c94deb		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x3BE 1749 bytes
embedded_file_obj0011.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x71E 199 bytes
embedded_file_obj0012.bin
a46cca18cc6ab33ff90e9d96682886f09f10a73249f85b69254ddb623185df34		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x811 123284 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
embedded_file_obj0013.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x1B3B 77 bytes
embedded_file_obj0014.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x1BE3 56 bytes

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