PDF malware analysis — malicious · d2b2e958a4b56849

MALICIOUS

PDF

12.5 KB Created: 2011-02-08 07:13:02 Authoring application: ped wig

MD5: c527d2510a25961267c2b85e0a9492f1 SHA-1: 0151e459afe0e70adc9764284315c10592bf1cd0 SHA-256: d2b2e958a4b568493bff25f9a3be387120cd905448d9f3b271d13ae0a7ac6de4

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.007 Command and Scripting Interpreter: JavaScript

The PDF file contains XFA form elements with embedded, obfuscated JavaScript. Heuristics indicate a heap spray exploit targeting XFA forms, which is designed to execute arbitrary code. The presence of an embedded file, specifically 'embedded_file_obj0014.bin', suggests it serves as a payload or part of the exploit chain. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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 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
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.

Extracted artifacts 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0011.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0xC48	84 bytes
`embedded_file_obj0004.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xCF9	228 bytes
`embedded_file_obj0016.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0xDEA	199 bytes
`embedded_file_obj0007.bin` `8c4fac4f00e2399da91a22272e42500f4ecc4f3292fee26537a0233a592a7e26`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0xEDA	119 bytes
`embedded_file_obj0009.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xF8F	77 bytes
`embedded_file_obj0006.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x1035	56 bytes
`embedded_file_obj0014.bin` `cde422065057a70acf9d5ad50b8ddfed15a2defe9e1a26ae79d3d78a52fdd5a2`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x136F	11470 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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