PDF malware analysis — malicious · f8f5788cf5331830

MALICIOUS

PDF

5.2 KB Authoring application: stb

MD5: b24ecd2e63482075a4f64128a4c84e19 SHA-1: 5019152347c76c94edf4e6049457a67864e3e3a1 SHA-256: f8f5788cf5331830b5c7bd8876b7e1c6b24f7c4f92fcc0a20b8b6bc70d37f1d2

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File

The PDF was flagged as malicious by an ML classifier with high confidence. It contains an embedded JavaScript payload, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The extracted artifact 'stream_001_off000002e2.js' is likely the malicious script responsible for further actions, such as downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. 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
`stream_001_off000002e2.js` `c4279e419fc659fbd50f4bcd403a4a7fceb76453775cfba819aeb95b7adbde8e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E2	73435 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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