PDF malware analysis — malicious · 3317b4b6d6b75335

MALICIOUS

PDF

12.8 KB Created: 2011-04-17 16:30:31 Authoring application: noo tin

MD5: d48849250c0be48e4fbe038e39304b3b SHA-1: 3d7fa30315e0c7bf2528b9ce2a8517dd8df740c7 SHA-256: 3317b4b6d6b7533502edb3c0f394945484a19d239c30ca3f7a6b49c9c832b4d8

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.007 JavaScript

The PDF sample contains XFA form elements and triggers a heap spray exploit, indicating an attempt to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. An embedded file, 'embedded_file_obj0011.bin', was also extracted, likely serving as the secondary payload.

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_obj0002.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xD6B	84 bytes
`embedded_file_obj0013.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xE1D	228 bytes
`embedded_file_obj0005.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0xF0D	199 bytes
`embedded_file_obj0012.bin` `a3a091d1e7d2099f3d63deea857b9d50af7ec44de5b6f83c4efd8a8e4a1abc1e`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0xFFE	119 bytes
`embedded_file_obj0003.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x10B5	77 bytes
`embedded_file_obj0007.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x115B	56 bytes
`embedded_file_obj0011.bin` `0cacb7bc720bb35f8e3b2ffc16ef68abb705d187ab619ba1a9ef4625bad301e2`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x1493	11475 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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