PDF malware analysis — malicious · 4303d127756416d4

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: 8bfa7d501b30fee9573d12b63c77c164 SHA-1: d158b9d343760df19091e31038f9dbcea1261e81 SHA-256: 4303d127756416d4a79ba4e9d3e0337d90a6eaf4ee9b5798a064cb6cbada3a04

74 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.007 JavaScript

The PDF file contains XFA form elements with risky executable scripts, indicated by the PDF_XFA_SCRIPT heuristic. It also embeds additional files, one of which was flagged for suspicious script obfuscation. The presence of these elements suggests the document is designed to exploit vulnerabilities and execute malicious code upon opening.

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.
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 0x3B48	85 bytes
`embedded_file_obj0042.bin` `b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x3BFA	1183 bytes
`embedded_file_obj0043.bin` `36b3852ff1385dd97536e1ed840d2b865e3e2a71d1dfb4344d04710508cc649b`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x3E4A	1745 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 0x4231	144 bytes
`embedded_file_obj0045.bin` `10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x42DD	77 bytes
`font_00_cff_off000043f1.bin` `062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2`	pdf-font-stream	PDF embedded font (cff) at offset 0x43F1	1192 bytes

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