MALICIOUS
186
Risk Score
Malware Insights
MITRE ATT&CK
T1204.002 Malicious File
The PDF sample contains critical XFA JavaScript heap-spray exploit code, indicated by the PDF_XFA_HEAP_SPRAY heuristic. This script is embedded within a decompressed stream, as flagged by PDF_EMBEDDED_SCRIPT_PAYLOAD. The primary function of this script appears to be the execution of a secondary payload, likely downloaded from an external source, as suggested by the embedded file artifact 'embedded_file_obj0010.bin'. The presence of unescape() and String.fromCharCode calls further supports the obfuscation and execution of malicious code.
Heuristics 8
-
XFA form contains risky executable script high PDF_XFA_SCRIPTPDF 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_SPRAYPDF 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_UNESCAPEunescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
-
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOADPDF 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_EMBEDDEDPDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
-
XFA form low PDF_XFAPDF uses XML Forms Architecture — can contain script logic
-
String.fromCharCode low PDF_FROMCHARCODEString.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
-
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.bind81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777 |
pdf-embedded-file | PDF EmbeddedFile object 8 at offset 0x120A | 84 bytes |
embedded_file_obj0009.bin24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0 |
pdf-embedded-file | PDF EmbeddedFile object 9 at offset 0x12BF | 228 bytes |
embedded_file_obj0010.bin9a3ddeadc8809615fbb73124380414f9b30b649686f88a0fd944d95af0519cbf |
pdf-embedded-file | PDF EmbeddedFile object 10 at offset 0x13B5 | 9206 bytes |
|
Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
|
|||
embedded_file_obj0011.binc97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460 |
pdf-embedded-file | PDF EmbeddedFile object 11 at offset 0x2317 | 199 bytes |
embedded_file_obj0012.bin55a274f8f33beda80a26d0558d1f8638f6e5800cbe0ed4de2bca0e195a29123f |
pdf-embedded-file | PDF EmbeddedFile object 12 at offset 0x240D | 131 bytes |
embedded_file_obj0013.bine6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876 |
pdf-embedded-file | PDF EmbeddedFile object 13 at offset 0x24D2 | 77 bytes |
embedded_file_obj0014.bin92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a |
pdf-embedded-file | PDF EmbeddedFile object 14 at offset 0x257D | 56 bytes |
Open this report in the interactive analyzer, or submit your own file for analysis.