PDF malware analysis — malicious · 0624a1d94e8a343e

MALICIOUS

PDF

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

MD5: 17d379bed6149a773463412e1ec142b3 SHA-1: 4b292398c41b7e3d8363cdc6c393357ce11edd05 SHA-256: 0624a1d94e8a343ea0e503b5cfdd322d7be56c4c1e8ac352cf11d9f9622c441e

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains XFA forms with executable scripts, flagged by multiple heuristics as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded scripts are likely responsible for downloading and executing a secondary payload, as suggested by the 'Pdf.Exploit.Dropped-81' ClamAV signature and the presence of embedded binary files.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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
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 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 0xDB	67 bytes
`embedded_file_obj0009.bin` `6b2260d3c78649345d3f0b850b831d545d33bb7017ccdf438cdfe1e9db7f2db2`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x167	294 bytes
`embedded_file_obj0010.bin` `6523e7ae411af77928f420056db8105f8669556415679a4194dcb9e8c2538902`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x2D8	533 bytes
`embedded_file_obj0011.bin` `3dc9a25bd9b5a050120071f2d12aa7ba9814dbabcff6d5a4b19f79219ac105bb`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x538	22901 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 0x5EF8	323 bytes
`embedded_file_obj0014.bin` `3275499da31d53b3a1c3d0d6c34dac803f5035cc26f0d36814d0b437d0e21cc5`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x6085	166 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 0x6171	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x6205	56 bytes

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