PDF malware analysis — malicious · f6b4db86f9492344

MALICIOUS

PDF

4.9 KB Created: 2011-04-05 23:46:28 Authoring application: bub lob

MD5: ab33c3cfa7043959e813834839c06424 SHA-1: ef960efc6363af000ab2f8f6c43a190b98736481 SHA-256: f6b4db86f949234498e2328c200af0cde486c0a0e13a19a55757d5899ba0fd4f

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter

The PDF file contains an embedded script payload, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript file, 'stream_001_off00000331.js', is likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload. The presence of XFA forms and embedded files are common characteristics of malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_001_off00000331.js` `263ea492c09617f9fb775f4ec6ed80cd6a486cf842134a5efdd5c6e06625ddec`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x331	13475 bytes

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