PDF malware analysis — malicious · 5d1cf2f47343f7ba

MALICIOUS

PDF

12.8 KB Created: 2011-01-25 13:50:44 Authoring application: nut wow

MD5: 706c3b9ceb05cadcf3dbd0374a6e5d44 SHA-1: 91187d3e88d17418db6763ec5e1637110b73ba94 SHA-256: 5d1cf2f47343f7ba6ccd4bca85ced6cc10c5891e31003e385a43b1b47ce8e6f0

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks when combined with JavaScript. The critical PDF_XFA_HEAP_SPRAY heuristic firing confirms the presence of exploit code designed to spray the heap. The ML classifier also strongly indicates maliciousness. The embedded file 'embedded_file_obj0019.bin' is likely the second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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://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_obj0010.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0xD75	84 bytes
`embedded_file_obj0001.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0xE26	228 bytes
`embedded_file_obj0002.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xF16	199 bytes
`embedded_file_obj0011.bin` `2d1c4b818d2ce173026fde2d159a38a45bfc557811f17565756c19f2e1de83fe`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1007	119 bytes
`embedded_file_obj0018.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x10BF	77 bytes
`embedded_file_obj0003.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x1165	56 bytes
`embedded_file_obj0019.bin` `8aee52822c32ae2e5b11691ea8bef36e5b914c5bbf47f7e62e0ddf684436284a`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x149E	12012 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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