PDF malware analysis — malicious · 85464a3ed08e6330

MALICIOUS

PDF

4.0 KB

MD5: a0b415f0abfa852796bc599423eaacc0 SHA-1: f744b99213a353771bea9191c89bdfb5bd886a66 SHA-256: 85464a3ed08e633040a6df17bbd304786b529fbe6809eced44c99b0d3f9237c4

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The PDF file contains XFA forms with embedded JavaScript, indicated by the PDF_XFA and PDF_XFA_SCRIPT heuristics. The embedded JavaScript, extracted as 'stream_000_off0000027f.js', is likely responsible for executing a malicious payload. The ML classifier strongly supports the malicious nature of this PDF. The primary attack vector appears to be exploiting the PDF's scripting capabilities to deliver a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_000_off0000027f.js` `df3828d80e77a6ab2a2f7384c5a1bd9b31245a36c0bdb55c2851a6ed1fa04392`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x27F	10201 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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