PDF malware analysis — malicious · 47f2bf32e10302ab

MALICIOUS

PDF

9.5 KB

MD5: 0ae3719e1dd101e3b848c3b2b869b02f SHA-1: 31303b8a6d76fbae5642bcab9d62ef7351923245 SHA-256: 47f2bf32e10302aba5cca451befac64d3fa2aa81fdd84d01fd2a543f7ec573b1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains XFA forms and embedded JavaScript, indicated by high-severity heuristics like PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD. The ML classifier strongly flagged this PDF as malicious. The deobfuscated JavaScript likely attempts to download and execute a second-stage payload, as suggested by the 'deobfuscated.js' artifact. The exact nature of the payload is not discernible from the provided evidence.

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` `2f3eb69b00fa4325a51f1c1c29fb8703e3fc69138bf540ddbe7b3a2e75ed10d3`	pdf-embedded-file	PDF EmbeddedFile object 41 at offset 0x52	1162 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`deobfuscated.js` `137b06863802fb7391efedcb122d51afb5c30431899a083084c6af893128133a`	deobfuscated-js	PDF JavaScript deobfuscation pass	1447 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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