PDF malware analysis — malicious · 8c3502463cf7ea66

MALICIOUS

PDF

12.3 KB Created: 2011-06-09 18:43:28 Authoring application: lea cud

MD5: b84abb61d3c884bc71e06d98a8a5eab7 SHA-1: 557869abdfed545b0c4db3e2e9d0fe74f0d92630 SHA-256: 8c3502463cf7ea667d8d8e553c46484fc12f75f9733cc5d2f2b283b36b5e7ac0

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

This PDF sample exhibits critical heuristic firings related to XFA heap spraying and embedded script payloads, strongly indicating an exploit attempt. The ML classifier also flagged it with high confidence. The presence of an embedded file, specifically 'embedded_file_obj0016.bin', suggests it serves as a dropper for a secondary stage. The exploit likely leverages JavaScript within the XFA form to achieve code execution.

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 0xBE7	84 bytes
`embedded_file_obj0002.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xC98	228 bytes
`embedded_file_obj0012.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0xD89	199 bytes
`embedded_file_obj0015.bin` `3748b82f293baa14342b74c7b585c833e3b01ec50ef62df83db742b91c7aae37`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xE7A	119 bytes
`embedded_file_obj0009.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0xF30	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0xFD7	56 bytes
`embedded_file_obj0016.bin` `b994ba5e8362f4ab99204d5cfce884cc4156aa8475bf6256f446326d7b5a6688`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x1310	11391 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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