PDF malware analysis — malicious · bfba2a54739ec25b

MALICIOUS

PDF

11.6 KB Created: 2010-11-28 20:08:56 Authoring application: cab jug

MD5: c916bd9044f5253ddc5d2103c36ee0e0 SHA-1: dae0de21c7db5bdda2be680b3d2ac75660791275 SHA-256: bfba2a54739ec25b91c324869af4d693e32e6c468e7d1987d3b4f6ec950c78c6

208 Risk Score

Malware Insights

The PDF sample contains critical XFA heap spray exploit code and risky executable script within an XFA form. The ML classifier strongly indicates maliciousness. The exploit likely targets a vulnerability to execute embedded code, as evidenced by the 'PDF_XFA_HEAP_SPRAY' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristics. The embedded file 'embedded_file_obj0007.bin' is the most likely 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_obj0013.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x92A	84 bytes
`embedded_file_obj0016.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x9DC	228 bytes
`embedded_file_obj0006.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 6 at offset 0xACC	199 bytes
`embedded_file_obj0004.bin` `0778a020f75774eb51ccdf3c855c00c921ce1e52f91d744822d2700b86d8164b`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xBBC	119 bytes
`embedded_file_obj0017.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0xC74	77 bytes
`embedded_file_obj0018.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0xD1B	56 bytes
`embedded_file_obj0007.bin` `8a6be94f79d2b1707f8b81a725298cbc16c6e51049245d3eae8594b728da2070`	pdf-embedded-file	PDF EmbeddedFile object 7 at offset 0x1053	11403 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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