PDF malware analysis — malicious · f7a0bd627deba18b

MALICIOUS

PDF

14.2 KB

MD5: 29662a7c77e16d7aee78e9945e0da0e9 SHA-1: 26f62970d0c749adcd69a301967cfb6fa84cc011 SHA-256: f7a0bd627deba18b9e0ca38e9e47700c4c5b46d18b051e1afabc721ff06ae327

156 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059 Command and Scripting Interpreter

The PDF sample contains heuristics indicating it is an XFA stager designed to exploit vulnerabilities. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of an embedded URL, although seemingly benign, could be part of a chain for downloading further malicious content. The XFA_TITLE_BASE26_EVAL_STAGER heuristic specifically points to a technique used to deobfuscate and execute code.

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 0x2AD6	85 bytes
`embedded_file_obj0042.bin` `dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x2B88	1029 bytes
`embedded_file_obj0043.bin` `d7f7bd6434fff4670f50233bfe5cf596fac9d4d44d97771942e495ed6801d5e8`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x2DA1	1949 bytes
`embedded_file_obj0044.bin` `3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169`	pdf-embedded-file	PDF EmbeddedFile object 44 at offset 0x3228	144 bytes
`embedded_file_obj0045.bin` `10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x32D4	77 bytes

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