PDF malware analysis — malicious · a19d7f94de424854

MALICIOUS

PDF

7.9 KB Created: 2008-08-19 12:14:36 Authoring application: avast5MG

MD5: 1bdc7c97a87a7ae5421b5dfc11bc27d9 SHA-1: 2ec14c147e6512b3c38115ae81a05b625ef3c73d SHA-256: a19d7f94de42485436e4a31cdcbeab7847f8ce1b4e6922caca0281b4a068eed0

68 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier as malicious with high confidence. Static analysis revealed an embedded script payload within a PDF stream, indicating an attempt to deliver secondary malicious content. The presence of an embedded file, specifically 'embedded_file_obj0012.bin', further supports this. The exact nature of the script's execution is not fully discernible due to potential obfuscation, but its presence strongly suggests a multi-stage attack.

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 0x21C	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x2CD	228 bytes
`embedded_file_obj0010.bin` `02bb339a443705d546cfa5889726f1dff6411f306b82c20135b2683cae3b56e1`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3BE	1735 bytes
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x719	199 bytes
`embedded_file_obj0012.bin` `af767c5449c76561ee0937176fe23aa774795166fc24747fe9eb364e0972c837`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x80C	122366 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 0x1AF1	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x1B99	56 bytes

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