PDF malware analysis — malicious · 47365da232da44f6

MALICIOUS

PDF

12.8 KB Created: 2011-02-07 20:55:25 Authoring application: vee bed

MD5: c8d442c394b9be00ff3e87876be25f5c SHA-1: 6a3255f57efe3f8a63f39750e21358badb2d0b7a SHA-256: 47365da232da44f6613571b378b54186f17b412f4f0a312646bb85e37bd14cf7

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF sample contains critical XFA heap spray exploit code and risky executable script within an XFA form. The unescape() call and embedded script payload further indicate malicious intent. The primary attack vector appears to be the exploitation of XFA forms to deliver a secondary payload, likely contained within the embedded_file_obj0014.bin artifact.

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_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE0E	84 bytes
`embedded_file_obj0005.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0xEBF	228 bytes
`embedded_file_obj0003.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xFAF	199 bytes
`embedded_file_obj0010.bin` `c06ff8109da825eeb13cdde06bf45e5990c31832d699f4812642e4bafdd35114`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x10A0	119 bytes
`embedded_file_obj0006.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0x1157	77 bytes
`embedded_file_obj0019.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0x11FE	56 bytes
`embedded_file_obj0014.bin` `1ba9aee12a6cb72fe5dc6f53535c858e233d1c869ca20285fe397faaa95288e1`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x1535	11468 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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