PDF malware analysis — malicious · db844042faf6de1e

MALICIOUS

PDF

16.5 KB

MD5: f98376db2b81bb27d16afa3d6d10f012 SHA-1: ba140945d1cf1d3f3f047935bba582fb0f41b62c SHA-256: db844042faf6de1e8528a1a455e7ecb6ba1ee22ae565224cc4857e87767cac08

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059 Command and Scripting Interpreter

This PDF document contains an XFA form with embedded executable script, a known vector for exploiting PDF viewer vulnerabilities. The ML classifier strongly indicates maliciousness. The presence of an embedded file, 'embedded_file_obj0008.bin', suggests a dropper or exploit delivery mechanism. The script is heavily obfuscated, preventing detailed analysis of its specific actions, but the overall pattern points to an exploit attempt.

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` `93051c8941c40aba4a842eedeadc03d75f1df6aa62eb48775817381f013faff6`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xC6	16171 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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