PDF malware analysis — malicious · f607f17d13202239

MALICIOUS

PDF

7.9 KB Created: 2008-08-19 12:14:36 Authoring application: avast5MU

MD5: bd325f3a57d9d0521be4886fc5168174 SHA-1: 4866b483be23dd6f079ba0c78ddc42774a2c4cfe SHA-256: f607f17d1320223928a70462f1049f3cc4feed31ab58d94140b60d90d456eb0d

68 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF file exhibits multiple indicators of malicious intent, including embedded files and a flagged embedded script payload. The ML classifier strongly suggests maliciousness. The presence of an embedded file named 'embedded_file_obj0012.bin' is a primary indicator of a potential secondary payload delivery mechanism.

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` `72df920e76aa8fe9ee02b7aec1ebd8100e9fa4c12fc1f394bd56bbb960174be3`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3BE	1756 bytes
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x720	199 bytes
`embedded_file_obj0012.bin` `1298ccd37e461144f003dbb95b7bd13b72f32db92a4a8b6c82a34e01a56ec948`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x813	122466 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 0x1B16	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x1BBE	56 bytes

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