PDF malware analysis — malicious · 3c5a9635929a0f76

MALICIOUS

PDF

5.6 KB

MD5: 9fb13cfe24bc3f8529c114dad4cc8376 SHA-1: ef1e5420b90570ce56bc6712f2973754da60d47a SHA-256: 3c5a9635929a0f76e0a6cf5b2940fa95873686e5d0991df6a97ed6d0299502b4

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier as malicious with a high probability. Static analysis revealed an embedded JavaScript payload within a PDF stream, which is a common technique for delivering exploits or secondary payloads. The presence of XFA forms also indicates a potentially complex document structure often abused for malicious purposes. The extracted JavaScript file, stream_000_off0000069c.js, is the primary artifact of interest for further analysis.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 3

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_off0000069c.js` `dc7d9318d0bab5b96917a1b1108aaa44ea7b7807056786fbb96343b5e2eaf8c3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x69C	15152 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 long base64-like blob(s).

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