Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8b053603b788b9…

MALICIOUS

PDF

9.1 KB Created: 2011-01-27 16:28:56 Authoring application: haw ick
MD5: 13cce15e5458055505c634e910f81056 SHA-1: 632a9720344dd96f758f52c1fc5264b69516acd5 SHA-256: 0a8b053603b788b9911d7e4ad6cad5c42d4416261185ea4f9daf4a127f38ba91
98 Risk Score

Malware Insights

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

The PDF sample contains XFA forms with executable scripts, a high-confidence indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript is likely designed to download and execute a second-stage payload, leveraging the XFA exploit to bypass standard PDF security measures. While specific IOCs are limited to benign Adobe and XFA schema URLs, the presence of embedded files and scripts points to a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • 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 low 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.
  • 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://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/
    • http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0012.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0xA63 84 bytes
embedded_file_obj0003.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0xB14 228 bytes
embedded_file_obj0002.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 2 at offset 0xC04 199 bytes
embedded_file_obj0015.bin
1d3a46b367280f05f095ed2238f49d5cdc44f34a6ecb5697964189c8ef53f97f		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xCF6 174 bytes
embedded_file_obj0004.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0xDE3 77 bytes
embedded_file_obj0013.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0xE8A 56 bytes
embedded_file_obj0010.bin
b182f005801f16ac62c1fa29a1e26fb7cee72521175af3312cefbec4279722c5		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x11C2 6431 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).

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