PDF malware analysis — malicious · 028bba9964b75d0e

MALICIOUS

PDF

70.5 KB

MD5: 6b58754e13f9f2eff53c091d982a1d7e SHA-1: 275e707e63426e62c25502fa41787e705a5020cf SHA-256: 028bba9964b75d0e8269590190cf989a8846e1731b8d2b3cc142d4ec7ec936ba

138 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains XFA forms and triggers high-severity heuristics for unescape() calls and risky executable scripts within XFA forms. The ML classifier strongly indicates maliciousness. The embedded file 'embedded_file_obj0008.bin' is likely a second-stage payload. The unescape function is used to deobfuscate JavaScript, which is then executed.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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/xfa-template/2.5/
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `a50f50a322e1c1cc943c38831194d60e77c5773432cf039bbe7ef8f8103e8eda`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xC6	71432 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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