PDF malware analysis — malicious · 3982aaeb3afc5987

MALICIOUS

PDF

6.9 KB Created: 2010-01-12 13:13:32 Authoring application: oldNameValueSD

MD5: c1a80f3130affd75968d2cf35a23f5bb SHA-1: 2964a3c97f710fd4a7bb849071cf7e529123fc89 SHA-256: 3982aaeb3afc598712cfb6eb2782e0270d9849f488f41bb7f66ace545cfef880

68 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1553.005 Mark-of-the-Web Bypass T1027 Obfuscated Files or Information

The PDF was flagged by a machine learning classifier with high confidence (0.999879) and exhibited multiple heuristic warnings, including embedded script payloads and suspicious extracted artifacts. The presence of embedded files, particularly 'embedded_file_obj0012.bin' which is significantly larger than others, suggests it is intended to deliver a secondary stage. No document body text was available for analysis, but the embedded script payload and ML classification strongly indicate malicious intent.

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` `9a8226c7e8efa7c9a5de0ac3fb5149215c8b06cd0cd17ebfbe18c39acec8ab84`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x220	84 bytes
`embedded_file_obj0009.bin` `6f0947ea838e32f7f02d109e1412ce71f5a213f84bd24687c3878fd8526715ce`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x2D1	242 bytes
`embedded_file_obj0010.bin` `d5d44e02cb17c92ecfe817a8e2bfc8b1c2a3ff61aee0275213ba8532c6546ce3`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3CC	1133 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `e65f0d3053c7dba00288152a82e0982d75449c675563ba727489452282fc8a1c`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x63E	219 bytes
`embedded_file_obj0012.bin` `fbf4ffc25b297f8dfa56d3d8833b4c33545bd61bcf6451b7071d1c6aa5d8e003`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x736	59055 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 0x16C7	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x176F	56 bytes

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