PDF malware analysis — malicious · de5e4c8a1a3fbd4f

MALICIOUS

PDF

29.5 KB Created: 2010-08-29 16:19:36 Authoring application: LocUv SuqEha

MD5: 9ee6cab03a5d2a7494f29e4621a95ded SHA-1: 1a5abbe25a294dcd79c83d551f0a81a1d12a5331 SHA-256: de5e4c8a1a3fbd4ff4ec2f8a614e57980c5bfd3e38f85a82421082a85344a460

268 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File Execution T1059 Command and Scripting Interpreter T1071 Application Layer Protocol

The PDF file contains XFA forms with executable scripts, triggering high-severity heuristics for PDF exploits and embedded script payloads. ClamAV detections indicate this is a known exploit dropper (Pdf.Exploit.Dropped-81) that likely downloads and executes a second-stage payload from an embedded artifact. The ML classifier strongly flags this PDF as malicious. The embedded artifacts, particularly embedded_file_obj0011.bin and embedded_file_obj0014.bin, are suspicious and likely contain the dropped payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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` `40323d578da0a65ddd7711ce04238b805263c5c8f7a9ad17745e83b8aa53e701`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3A9	616 bytes
Detection ClamAV: Pdf.Exploit.Agent-36318 Obfuscation or payload: unlikely
`embedded_file_obj0011.bin` `83b06abedc9ed1e65a0cdcac5f1cd2fbb5dc3d966e426f5689d86e6b2d77d9bf`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x65C	26701 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 0x6EF4	323 bytes
`embedded_file_obj0014.bin` `8c36a288b9509c52dfd8c5ca5dbeabac949ddc9b189c1e9a6e3c8acb8511e822`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x7081	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 0x7169	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x71FD	56 bytes

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