PDF malware analysis — malicious · f5f49e499f240cd2

MALICIOUS

PDF

14.1 KB

MD5: 1e6a76f6e11a2c138633883c9bf0a6a7 SHA-1: 8a5e1a140841924faeb052e284bd6b61f36dc7f7 SHA-256: f5f49e499f240cd2b6286a62601e76f4ca036d20d1c513650b331acc710efd7d

154 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter

The PDF file contains heuristics indicating it is an XFA form with a stager designed to execute code. ClamAV detection as 'Pdf.Exploit.Agent-36962' further confirms its malicious nature. The embedded URL, while seemingly benign, is associated with the XFA schema and could be part of the exploit chain. The primary attack vector appears to be exploiting PDF vulnerabilities, specifically within XFA forms, to deliver a payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-36962 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36962
XFA title base-26 eval stager high PDF_XFA_TITLE_BASE26_EVAL_STAGER

PDF XFA initialize script reads an encoded payload from the document title, builds event.target.eval and String.fromCharCode from string fragments, decodes base-26 character pairs, and evals the recovered stage. This is an exploit-kit staging pattern; the static bytes do not prove a specific CVE by themselves.
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
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 5

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 0x2ACC	85 bytes
`embedded_file_obj0042.bin` `dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x2B7E	1029 bytes
`embedded_file_obj0043.bin` `d7f7bd6434fff4670f50233bfe5cf596fac9d4d44d97771942e495ed6801d5e8`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x2D97	1949 bytes
`embedded_file_obj0044.bin` `3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169`	pdf-embedded-file	PDF EmbeddedFile object 44 at offset 0x321E	144 bytes
`embedded_file_obj0045.bin` `10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x32CA	77 bytes

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