PDF malware analysis — malicious · 879c72b32cc7634f

MALICIOUS

PDF

29.4 KB Created: 2010-08-29 16:19:36 Authoring application: WjUzu JofydiguqtnEfyjica

MD5: be75dfe2599721da045b1cb8299688dd SHA-1: db25b75dbe8310af146f5c579871ed35e46f686c SHA-256: 879c72b32cc7634fb7bf614068d4b82dc7ef5606a7414fe8ab9cf0c73a4f629a

198 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains XFA forms with risky executable scripts, indicated by multiple high-severity heuristic firings including PDF_EVAL and PDF_XFA_SCRIPT. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded scripts are likely designed to download and execute a second-stage payload, as evidenced by the embedded files and the 'Pdf.Exploit.Dropped-81' ClamAV signature.

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 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` `51ce33e1f6cc4ea091d23898ff424d636a2736e0a0a9cb835406bdf85e1acc9e`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x3A9	581 bytes
`embedded_file_obj0011.bin` `a91a8ebef2862069b38f70920a7d75d3355f8ebe799f534c03812647ad3037b0`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x639	26586 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 0x6E5E	323 bytes
`embedded_file_obj0014.bin` `35877971fd7cce1e4b6d4b4f30c3f2ccbaaf69a3f00be9427a086aaa86b51c04`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x6FEB	190 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 0x70EF	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x7183	56 bytes

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