PDF malware analysis — malicious · f38549b9dbfd950c

MALICIOUS

PDF

65.6 KB

MD5: 18ccb48b456e609e27ca0a1462709d78 SHA-1: 00e68e23f3d07b368974e879a277198b2f5477e6 SHA-256: f38549b9dbfd950ce6f8a8d3fde9f03b92faba3fe80a3eecd251680baec194f3

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution

The PDF sample contains multiple high-severity heuristics indicating it is malicious, including PDF_UNESCAPE, PDF_EMBEDDED_SCRIPT_PAYLOAD, and PDF_XFA_SCRIPT. An embedded file, 'embedded_file_obj0008.bin', was also extracted. The ML classifier strongly flagged this PDF as malicious. The presence of these indicators suggests the document is designed to exploit PDF vulnerabilities to deliver a secondary payload.

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 script payload in PDF stream medium 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.
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
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` `25b33c2b6c4875eef3cb8a2e14b84cb103cbae0ad15c31d0be7d56f029541a97`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xC6	66413 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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