PDF malware analysis — malicious · b1f4e8707c500be8

MALICIOUS

PDF

29.3 KB Created: 2010-08-29 16:19:36 Authoring application: BofrexyNunecbuni FespUjy

MD5: d6978f8d18c104c757e6caa3d37d3380 SHA-1: eebfb189d6aa8aef9b112f78c66e3794bce886fd SHA-256: b1f4e8707c500be88a26ea72359e276f7ddc5fae4bbcb07b429e78cf7aaa8298

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded executable scripts and is flagged by ClamAV as Pdf.Exploit.Dropped-81. High severity heuristics indicate the presence of risky executable scripts within an XFA form, and an eval() call suggests dynamic code execution. The embedded scripts are likely responsible for downloading and executing a second-stage payload, contributing to the malicious nature of the document.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://ns.adobe.com/xtd/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x1AB	67 bytes
`embedded_file_obj0009.bin` `6b2260d3c78649345d3f0b850b831d545d33bb7017ccdf438cdfe1e9db7f2db2`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x238	294 bytes
`embedded_file_obj0010.bin` `f47876779dc9029d89a1910200d3a7d0fc6ed70f6510e9ca9fedb6a6107bd3ff`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3A9	620 bytes
`embedded_file_obj0011.bin` `94e2d140c2e881843f03e030352b100c350db8d3f80e186a3b4375f866339f35`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x660	26531 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0012.bin` `103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x6E4E	323 bytes
`embedded_file_obj0014.bin` `6eaa5a6c76ef151fb516dcbf48d879f162673ccf162cd58b1487111327f29cbc`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x6FDB	162 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`embedded_file_obj0015.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x70C3	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x7157	56 bytes

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