PDF malware analysis — malicious · c8de72042513c8e9

MALICIOUS

PDF

14.0 KB

MD5: d935e8bd9081a79202d6ef8dc0371dae SHA-1: fc00d891f9c1a53a7c6994ac48c69b8633c6af0b SHA-256: c8de72042513c8e9ebaf18f1f3a3b98f5a0a46ec5824da8aac704557fd01b7ef

188 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF contains XFA form elements and JavaScript that triggers a heap spray exploit, indicating a malicious intent to deliver a payload. The embedded JavaScript, stream_000_off00000043.js, is highly suspicious and likely responsible for the payload delivery. ClamAV detection further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 6

XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
ClamAV: Pdf.Dropper.Agent-6290743-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6290743-0
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
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_000_off00000043.js` `91331e5a3bd1f4ddb9c9607c35fa28eecd8fc913758395d4a23763f333ba302d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x43	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 15 long base64-like blob(s).

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