PDF malware analysis — malicious · bd1960be4bb9cf1b

MALICIOUS

PDF

9.5 KB

MD5: b8d59005d04fb98a350c9589f280cb87 SHA-1: a677d372d983af8395ca59a6a30676c567409978 SHA-256: bd1960be4bb9cf1bad007d14ddc3141161d00c980170024cba8cb00ed8e85d4e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains XFA forms and embedded JavaScript, as indicated by the PDF_XFA and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. The embedded JavaScript, found in 'deobfuscated.js', is likely responsible for executing a second-stage payload. The ML classifier strongly indicates maliciousness. The exact nature of the payload is not fully discernible from the provided information, but the presence of obfuscated JavaScript points to a downloader or exploit execution.

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0041.bin` `d0642df403a3dc05d43bd0cbe64cf318c7efcafc843907c2872357e5a3723469`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1165 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `4a5332422dcdcfa650f49b829591dd2f2201dafdde55352ab08aa689f8f651f1`	deobfuscated-js	PDF JavaScript deobfuscation pass	2095 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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