PDF malware analysis — malicious · 0f1db66312189856

MALICIOUS

PDF

5.8 KB

MD5: 55326bc83751eab9e4a2deb9087c0c0f SHA-1: 00b69805dea99c91f70f537e52d5d7e1ddebb3d8 SHA-256: 0f1db663121898563947138234ca8850c3ff8d334ac4b370a3838b18a22b24db

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample utilizes XFA forms and embedded JavaScript, indicated by PDF_XFA and PDF_XFA_SCRIPT heuristics. The presence of PDF_EVAL and PDF_UNESCAPE suggests the script is designed to deobfuscate and execute malicious code. The ML classifier strongly flags this PDF as malicious, and an embedded file artifact was also identified, pointing towards a downloader or exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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
Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://ns.adobe.com/xtd/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `ef62e46517e0ab9128be5d63feaf817466470f1173e71e6b58c21218c5c2f3c8`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x35B	47 bytes
`embedded_file_obj0009.bin` `101ba7115e4b42f8f582812aa8c52e1372a145b22f143ddc24dfad027378eef6`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x3E7	229 bytes
`embedded_file_obj0010.bin` `8d2b8e5f0d98cd971e10a5f82cf05e2d035f5909b43124a08e3f9c399f1ded5e`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x4DA	19108 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `e1c68077d11dccab0579be0ccb04561b7f732fa1883680eef6e55b9e9477fe22`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1149	200 bytes
`embedded_file_obj0012.bin` `3e128fd41074c2b6107a2c2cce040375b12269f3f8ec9af175fce9743e60fe68`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x123B	120 bytes
`embedded_file_obj0013.bin` `863fe193664516f0db42fd686d863a1b9cad88d3d0cb37f8d2f8497979368f02`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x12F4	78 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x139C	56 bytes

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