PDF malware analysis — malicious · 2a5f368478eb6b76

MALICIOUS

PDF

19.7 KB Authoring application: .132.141.72.156.133.148.141.130.147.136.142.141.63.126.104.82.71.126.104.80.72.154.145.132.147.92.70.70.90.133.142.145.71.136.92.79.90.136.91.126.104.80.77.139.132.141.134.147.135.90.136.74.92.81.72.1 (via .126.104.84.156.133.148.141.130.147.136.142.141.63.126.137.82.71.72.154.126.137.83.92.126.139.84.71.72.90.136.133.71.126.137.83.91.88.79.79.79.72.154.126.137.84.92.70.142.74.148.96.114.137.134.134.134)

MD5: 117feaaf4c5dacd27e08ac574d546fe1 SHA-1: 5a5b00a127296338a479d403d6e797c8c581d039 SHA-256: 2a5f368478eb6b769d99080cec92a74019dd46f9b55af72221ee07fe98d32adf

96 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.007 JavaScript/VBScript

This PDF document contains a high-severity heuristic firing for XFA form scripts, indicating the presence of executable code within the form. The ML classifier also flagged this PDF as malicious with high confidence. The embedded file and the XFA script suggest an attempt to download and execute a secondary payload. The URL provided is likely related to the XFA form structure but may also be a lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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://www.xfa.org/schema/xfa-locale-set/2.1/

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0041.bin` `c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x3B21	85 bytes
`embedded_file_obj0042.bin` `b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x3BD3	1183 bytes
`embedded_file_obj0043.bin` `931108dda7cc7bb198b2355eb58e1b47ce765477b1dfc1ae7b8ab76c8b202c29`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x3E23	1770 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0044.bin` `3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169`	pdf-embedded-file	PDF EmbeddedFile object 44 at offset 0x4216	144 bytes
`embedded_file_obj0045.bin` `10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x42C2	77 bytes
`font_00_cff_off000043d6.bin` `062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2`	pdf-font-stream	PDF embedded font (cff) at offset 0x43D6	1192 bytes

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