PDF malware analysis — malicious · bb55fef755d35f59

MALICIOUS

PDF

6.8 KB Created: 2008-08-19 12:14:36 Authoring application: acrobatUU

MD5: c53be99294f9363568b9000b95e6f536 SHA-1: d39ad5d14550b48e5bcb8ede887085a14684e25f SHA-256: bb55fef755d35f5914aac7f4a5945ce8d1abf1aac688badfc2876ac4963e8dff

68 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier as malicious with a high confidence score. Static analysis revealed multiple embedded files, one of which is a significant size and flagged as a suspicious artifact. This indicates the PDF is likely a dropper or downloader for a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

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
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x216	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x2C7	228 bytes
`embedded_file_obj0010.bin` `3cd9e1f012a1f0e74e78327e2869feaccbda5acdd27ad9c5e981f06cded6eae7`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3B8	1615 bytes
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x6D8	199 bytes
`embedded_file_obj0012.bin` `089bddb29fee58f5f5a9944a70e3f00b5de238f205598724bd57670a2a0fa4c9`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x7CB	38570 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x16A0	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x1748	56 bytes

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