PDF malware analysis — malicious · 15977b870ca0af48

MALICIOUS

PDF

19.1 KB

MD5: 2578563a95eb93c8642fd4404de7f1bf SHA-1: ee92aa784e33f29133664f3b0875a5557eddc469 SHA-256: 15977b870ca0af48eaf66903fcc6a74e3512f6d3836cd9c6ff25a0816b2cfd73

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including PDF_XFA_SCRIPT and ML_NYX_PDF_MALICIOUS, indicating the presence of executable script within an XFA form. ClamAV detection as Pdf.Exploit.Agent-36928 further confirms its malicious nature. The embedded script likely attempts to exploit vulnerabilities or download a secondary payload, aligning with common attack patterns for malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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/
- http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.2/
- http://www.xfa.org/schema/xfa-data/1.0/

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 0x3972	85 bytes
`embedded_file_obj0042.bin` `dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91`	pdf-embedded-file	PDF EmbeddedFile object 42 at offset 0x3A24	1029 bytes
`embedded_file_obj0043.bin` `d55fa07f327f29e42c02d4639aecaf44fd937336b354a0f93363700a573d3a00`	pdf-embedded-file	PDF EmbeddedFile object 43 at offset 0x3C3D	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 0x3FCB	144 bytes
`embedded_file_obj0045.bin` `10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275`	pdf-embedded-file	PDF EmbeddedFile object 45 at offset 0x4077	77 bytes
`font_00_cff_off0000418b.bin` `062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2`	pdf-font-stream	PDF embedded font (cff) at offset 0x418B	1192 bytes

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