PDF malware analysis — malicious · b63309850744960f

MALICIOUS

PDF

29.3 KB Created: 2010-08-29 16:19:36 Authoring application: Kafuyj RoxEk

MD5: afb7e8882b16823ca7a4f84ec927cb54 SHA-1: e2cf0be832cb179bed088461e49d63f128bb988c SHA-256: b63309850744960f4e441eb2231f223d78b0fa4d9f8023c07c490b218d6ca56d

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file contains embedded executable scripts and triggers multiple high-severity heuristics related to PDF exploits and XFA forms. The ML classifier strongly indicates maliciousness, and ClamAV detection confirms it as Pdf.Exploit.Dropped-81. The embedded scripts are likely responsible for downloading and executing a second-stage payload, a common technique for exploiting PDF vulnerabilities.

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` `e0f1b764a3c1c67e5a92ecdc6d034a956910d2ba594bfb22ca1ae9845f55718f`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3A9	612 bytes
`embedded_file_obj0011.bin` `21626468173086cc9cecbb050da491bb7fb46107ee80503dfdac8aae4bc514e2`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x658	26475 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 0x6E0E	323 bytes
`embedded_file_obj0014.bin` `d2bd3104ff6a496d4d8496c5b7ef367bdde8db7188f5e794fcbea79148e6b0d0`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x6F9B	170 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 0x708B	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x711F	56 bytes

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