PDF malware analysis — malicious · a157f47077166753

MALICIOUS

PDF

7.9 KB Created: 2008-08-19 12:14:36 Authoring application: avast5T

MD5: a2cf884b95db9d5fdc26073062188abe SHA-1: 873a7dfc3c08ab615ad55ffd91f3c5b9cedc0db6 SHA-256: a157f47077166753b9633cfc39e059065c4b10d47020d6aa08e53b78918d832b

68 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF was flagged by a machine learning classifier with high confidence (0.999885) and heuristics indicate an embedded script payload. The embedded script is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic and the presence of a large embedded binary artifact. The XFA form and embedded file heuristics further support the malicious nature of the document.

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` `26b9cb7e122e3d8892a2594480c1db07da2e1878c9ad339653b86b24c59159ee`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3BE	1750 bytes
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x720	199 bytes
`embedded_file_obj0012.bin` `3040261b42d3e5700f126c608eb5ee66e3d0bfb67b875248e16f65fa41fdda04`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x813	123164 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 0x1B09	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x1BB1	56 bytes

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