PDF malware analysis — malicious · 35573d7b5793f6b5

MALICIOUS

PDF

13.7 KB Created: 2010-09-16 08:53:18 Authoring application: dom bey

MD5: eca202fd39c137d8618cab5928274b63 SHA-1: 876894e0faff6b4fac08779d10389fd12012c20d SHA-256: 35573d7b5793f6b56f62541ad65d42fbb8abbaa49cda354560bb651b73e0f12a

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter T1059.007 JavaScript

The PDF sample contains XFA form elements with JavaScript that triggers a heap spray exploit. This exploit is designed to decompress and execute a script payload, likely for downloading and running a second-stage malicious binary. The ML classifier strongly indicates maliciousness, and the presence of an embedded file further supports this.

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_obj0007.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x9C4	84 bytes
`embedded_file_obj0019.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xA76	228 bytes
`embedded_file_obj0008.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xB66	199 bytes
`embedded_file_obj0002.bin` `72bb88b4391308f447f085934d1169f3e9545307a114afbea902b3197f7a1df5`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xC56	119 bytes
`embedded_file_obj0017.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0xD0D	77 bytes
`embedded_file_obj0003.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xDB3	56 bytes
`embedded_file_obj0001.bin` `09a22e3cf16652cd62bcc6ed8e5f36fb5386c8b84b6946eee9b4a9b8bc88c830`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x10EC	15161 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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