PDF malware analysis — malicious · 646f1db1835103f6

MALICIOUS

PDF

15.2 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap

MD5: 1ef030552620c48753c51e4d627707ef SHA-1: 99797fa787ab4fb6c1e6959cf051085778106ea9 SHA-256: 646f1db1835103f6aeaa99b5bd2661452d097a5db07799508dca253ece14c041

198 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains XFA forms with executable scripts, triggering high severity heuristics for embedded scripts and eval() calls. ML classification and ClamAV detection strongly indicate malicious intent. The presence of embedded files, particularly 'embedded_file_obj0014.bin', suggests it acts as a dropper for a secondary payload, likely executed via the XFA script.

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 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
Embedded script payload in PDF stream low 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.
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 7

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 0xDB	67 bytes
`embedded_file_obj0010.bin` `5f70b878e3d54dde19570d8a7ff0baeaff8a890ed05f630bed70eb78cbc4a245`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x168	779 bytes
`embedded_file_obj0011.bin` `be1f727b76af0cd2d4f9d363cbb70036d843a843374b0743c4cca944ecc139ff`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x4BE	456 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 0x6D1	323 bytes
`embedded_file_obj0014.bin` `7f67c07072c3166bf81956a7239e338515d4a8353fc3e4d48f3a66c9b9fffd5f`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x85E	12263 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 0x388B	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x391F	56 bytes

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