PDF malware analysis — malicious · 01059653c1dd0425

MALICIOUS

PDF

13.7 KB Created: 2011-04-21 00:33:16 Authoring application: dee kas

MD5: 8f4a9d64edac5527676ff7c8db6a9b55 SHA-1: d8c5a51655dbcfce9e958a1fd046ad386eb46341 SHA-256: 01059653c1dd04255025bb990813f9a5a0ddce594c44bf159beeb5651f3c7485

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF document contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating an attempt to obfuscate malicious code. The presence of XFA forms and embedded script payloads, along with a high ML classifier score, strongly suggests the execution of a secondary payload. The embedded file `embedded_file_obj0018.bin` is likely the dropped payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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://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/
- http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0012.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x176A	84 bytes
`embedded_file_obj0010.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x181C	228 bytes
`embedded_file_obj0003.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x190C	199 bytes
`embedded_file_obj0001.bin` `9caaaddd68a9e1dc9d09edcb0bbe32d095e3156b48fa5780488f6c23c18222fd`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x19FD	154 bytes
`embedded_file_obj0004.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0x1ACE	77 bytes
`embedded_file_obj0009.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x1B74	56 bytes
`embedded_file_obj0018.bin` `77121e4557d9f625a7a96729fa46eee0245f21ba0e053a37b42cd5e6e73bb600`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x1EF6	20472 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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