PDF malware analysis — malicious · 426423ea74c893a3

MALICIOUS

PDF

19.1 KB

MD5: 4fae739cca143a8d589624bdad503bbf SHA-1: fed64359ea49dd8c52f86bb7ad774ce41bf7caa1 SHA-256: 426423ea74c893a31fdd12cbdb3007410b30e99248446590e41e16f99f53a071

134 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF sample triggered critical ClamAV detection for 'Pdf.Exploit.Agent-36928', indicating a known exploit. High severity heuristics for 'PDF_XFA_SCRIPT' and 'PDF_EMBEDDED' confirm the presence of executable scripts within an XFA form and embedded files. The embedded URL, while benign on its own, is associated with the exploit context. The primary attack vector appears to be leveraging XFA form vulnerabilities to execute scripts, likely for downloading and executing a second-stage payload.

Heuristics 8

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.
ClamAV: Pdf.Exploit.Agent-36928 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36928
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 0x3960	85 bytes
`embedded_file_obj0042.bin` `dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x3A12	1029 bytes
`embedded_file_obj0043.bin` `d55fa07f327f29e42c02d4639aecaf44fd937336b354a0f93363700a573d3a00`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x3C2B	1608 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 0x3FB9	144 bytes
`embedded_file_obj0045.bin` `10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x4065	77 bytes
`font_00_cff_off00004179.bin` `062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2`	pdf-font-stream	PDF embedded font (cff) at offset 0x4179	1192 bytes

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