PDF malware analysis — malicious · 3d4b33235cb9c21f

MALICIOUS

PDF

28.2 KB

MD5: fb1a05b77b8856a2f99c31bf76f55961 SHA-1: 8bce7a497d9f8cfaef81b97d3821383793a509b9 SHA-256: 3d4b33235cb9c21fb57593a2d0283126d08fac879a5297544f5ac62cea0a80d0

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by multiple heuristics, including ML classification and ClamAV detection for obfuscated objects. An embedded script payload was identified, suggesting an attempt to execute malicious code. The presence of XFA forms and the use of String.fromCharCode indicate obfuscation techniques commonly used in PDF-based attacks. The embedded artifact 'embedded_pdf_script_00000082.bin' is a key indicator of the malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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
`embedded_pdf_script_00000082.bin` `afeb92e223f0108ea9bce81837ea19a83cd8342db5840c54f61a2f799cb73f47`	pdf-embedded-script	PDF raw stream script payload at offset 0x82	27471 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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