PDF malware analysis — malicious · decc9b3253924c2e

MALICIOUS

PDF

5.3 KB Authoring application: stb

MD5: 06761feb62db7a4d6b62d623bedac544 SHA-1: 77c5fd2dc476826f44eb333c3452f480d51566ae SHA-256: decc9b3253924c2e33a082b01d6ea54fe57fc6f404c836d3dda631b02c8b1110

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains an embedded JavaScript payload, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, 'stream_001_off000002e7.js', is likely responsible for executing the malicious actions, potentially downloading and executing further stages.

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_off000002e7.js` `d7c07619837490e8a009c31099f30883107d58b15085f5b1e1e1011e665f3dda`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2E7	73945 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 long base64-like blob(s).

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