PDF malware analysis — malicious · 0b28af3a7cf87b00

MALICIOUS

PDF

5.8 KB

MD5: 23db3d7148a1aa4002804918adeac4d6 SHA-1: b8b961de17d210146a02adc4cb735d348e85d178 SHA-256: 0b28af3a7cf87b00dba96b16e9664a6e9cbf058fedc95ba1dc8cf4ac3174bc79

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains XFA forms with embedded JavaScript, indicated by PDF_XFA_SCRIPT and PDF_EVAL heuristics. The script is obfuscated and likely responsible for downloading and executing a secondary payload, as suggested by the embedded_file_obj0010.bin artifact. The ML classifier strongly indicates maliciousness.

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` `f491c160287b7d005e894188167393c1958d12ea1e0bac1c4494f82dd4cfb32f`	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 0x1148	200 bytes
`embedded_file_obj0012.bin` `3e128fd41074c2b6107a2c2cce040375b12269f3f8ec9af175fce9743e60fe68`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x123A	120 bytes
`embedded_file_obj0013.bin` `863fe193664516f0db42fd686d863a1b9cad88d3d0cb37f8d2f8497979368f02`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x12F3	78 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x139B	56 bytes

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