PDF malware analysis — malicious · f788b91bea3f8f0a

MALICIOUS

PDF

5.1 KB Created: 2011-04-05 23:46:28 Authoring application: sab

MD5: 9bf5f7308a5eea60b562de1f4212cad4 SHA-1: 88af93bcd8eb32b5cfee4fe2dc4b96ceadffbed8 SHA-256: f788b91bea3f8f0a3126a613f2414fd9077837b5c93319f1b4dfd075121c6ef3

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

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, named 'stream_001_off00000302.js', is the primary artifact suggesting malicious intent. While the exact script functionality is not detailed, its presence within a malicious PDF strongly implies it's designed to download and execute a second-stage payload or perform other harmful actions.

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_off00000302.js` `0937532c2f982621eecd14184d5d8ad43d85a9102a2df98c1b6b6c5a0a2627bb`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x302	55172 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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