PDF malware analysis — malicious · cee9dc92a48c9289

MALICIOUS

PDF

13.0 KB Created: 2011-05-30 16:16:29 Authoring application: nor dim

MD5: c27796767c5e86d6eb21bfe087fdecc0 SHA-1: 1582168d126b4e1a19a53c56df9994c6d1893b42 SHA-256: cee9dc92a48c92898151f3f6aca240c982cb2491096ef248c99c69afd001f0b5

208 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The PDF sample contains XFA form elements with embedded JavaScript that triggers a heap spray exploit. This exploit is designed to download and execute a secondary payload, indicated by the embedded file artifact. The ML classifier strongly flags this PDF as malicious, and the presence of XFA heap spray and embedded script confirms a high likelihood of malicious intent.

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_obj0004.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xE58	84 bytes
`embedded_file_obj0018.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0xF0A	228 bytes
`embedded_file_obj0017.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0xFFB	199 bytes
`embedded_file_obj0010.bin` `be885068b3474a9e5da5cfda86e2fe235d1c77b3c5cd93d1ab2c7f4dcfe36a9f`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x10EC	119 bytes
`embedded_file_obj0001.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x11A2	77 bytes
`embedded_file_obj0007.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x1248	56 bytes
`embedded_file_obj0003.bin` `e9c9f8a2c478f69cabf1c1793b7d69ddb27278c232f596fcb81cdf69a00f8cbf`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x157E	11406 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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