PDF malware analysis — malicious · f4fd98e7d6b6a1bc

MALICIOUS

PDF

4.1 KB

MD5: a7881ef9de398d311ba60d5980723ef0 SHA-1: 0e86d7b719712ada01784c453ad771dafa4fc84f SHA-256: f4fd98e7d6b6a1bc4a243c7d8120d7d57175c8222f0234d6da501f0ba5fd1ded

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains XFA forms and embedded JavaScript, indicated by multiple high-severity heuristics. The embedded JavaScript, extracted as 'stream_000_off0000027b.js', is likely responsible for executing the malicious payload. The ML classifier strongly flags this PDF as malicious. The exact function of the script could not be fully determined due to potential obfuscation, but its presence within an XFA form is a strong indicator of malicious intent.

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_off0000027b.js` `1753d3787845a68d124c0c8d69110ac279f3e4708a3f865d838c0fb101e6dd4f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x27B	10321 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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