PDF malware analysis — malicious · a3b875a5c5ddbeb7

MALICIOUS

PDF

12.8 KB Created: 2010-12-17 17:03:39 Authoring application: bat zee

MD5: 32e4e3b1afc10acdf6ef1a967650af52 SHA-1: 8c6c2d6d85e92e3d7f778a13a08148ad7854c34d SHA-256: a3b875a5c5ddbeb770f806dea1551525650f1147541421211dfd7b88cf6d967e

208 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious JavaScript

The PDF sample contains critical XFA JavaScript heap-spray exploit code and triggers an XFA event, indicating it's designed to execute arbitrary code. The presence of an embedded script payload and the ML classifier's high confidence further support this. The primary mechanism appears to be an XFA form vulnerability leading to script execution, likely for downloading further malicious content.

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_obj0014.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0xD61	84 bytes
`embedded_file_obj0013.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xE13	228 bytes
`embedded_file_obj0002.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xF03	199 bytes
`embedded_file_obj0015.bin` `77488527e477df001391704b146d4e55fde11bb5bacce2256f0065b73a637850`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xFF4	119 bytes
`embedded_file_obj0010.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x10AC	77 bytes
`embedded_file_obj0012.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x1153	56 bytes
`embedded_file_obj0009.bin` `10586c70fb11253eb60036405585684756f0b27a6c21554b9c683e8018f17813`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x1489	11549 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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