PDF malware analysis — malicious · 05a1f62b4a4b2ca8

MALICIOUS

PDF

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

MD5: f87d999083d60d40ae22ecf2a8b3db00 SHA-1: e7e0e2642f446d6f5110a52ef4de5b5952d9017c SHA-256: 05a1f62b4a4b2ca87f1e331a021ee97c1485797ae012235eb7eeb25006ea2846

266 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file that exploits CVE-2010-0188, a known vulnerability in Adobe Reader related to XFA forms. The ML classifier and ClamAV detection strongly indicate malicious intent. The exploit likely leads to the execution of a dropped payload, although the specific nature of the payload is not detailed in the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188

PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
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
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/
- 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/

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `480a1e9a6934b7257e583f1b9b61f6fe39b0ff00ba2d3f0ad5b27bcdeb2f2d86`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xD7	133 bytes
`embedded_file_obj0010.bin` `d4ff871de6628873a7035e48c3dfa9affd8413c4e514b4f2b79a912efb0ddaf9`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1A5	712 bytes
`embedded_file_obj0011.bin` `4c73db6062d5375b89d2d93aed8bbee07600fa94b92e578c9718df7f31152ef8`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x4B8	427 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 0x6AE	323 bytes
`embedded_file_obj0014.bin` `fd71a721c6ec5b0357504729b127ea90152573d7262e6d50bce143c93970355e`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x84F	10372 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 0x12D7	77 bytes
`embedded_file_obj0016.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x136B	56 bytes

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