PDF malware analysis — malicious · 8939578a45927e71

MALICIOUS

PDF

70.4 KB

MD5: 6fd0f3efac6fdeae62c09936c196cb9e SHA-1: 8ce68053e36e551ac01a7ffdfdd90b41bb614869 SHA-256: 8939578a45927e7113f67531ca1f923647cf06a92a1d6b27a6638df4d517f1c3

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample utilizes an XFA form with embedded JavaScript, indicated by PDF_XFA_SCRIPT and PDF_EVAL heuristics. This script is designed to execute, likely downloading and running a secondary payload from one of the embedded files, such as embedded_file_obj0011.bin. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it's a downloader.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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://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.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xD7	67 bytes
`embedded_file_obj0009.bin` `5c22d8a763a73b763d2ab66d21a4f9cd8f141b27bb1e81aff272c9870dc6327b`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x162	677 bytes
`embedded_file_obj0010.bin` `ef64f4d8e0c7b26e80c8798a73f0e8bf2d667a79e1d5eb1af87ad7c37819148d`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x452	190 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `6be5265ab86295d2e122ebc62422fd73ff2f7f349cc611867a8836f7ffed8667`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x55B	69342 bytes
`embedded_file_obj0012.bin` `6dfc2cfc739bf5cd5514e048143c782a1af7b4c86ed10bd88203471efa9b3fe7`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x11484	389 bytes
`embedded_file_obj0014.bin` `9f69c42e66b0c1666412737dc9cf4aa42379ee793c4ad8d07130781756ea33d5`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x11656	65 bytes
`embedded_file_obj0015.bin` `51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x116E1	147 bytes

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