PDF malware analysis — malicious · d6ec388b4c261be3

MALICIOUS

PDF

14.6 KB Created: 2010-10-15 14:23:58 Authoring application: yen vaw

MD5: a0457c9b7c2e8b7ea98de9bbea48c60d SHA-1: 82ef9ea504765e8b1f8d76e8d6afbe99a648ae05 SHA-256: d6ec388b4c261be309509de81efa600ce20129e39ac72e15c19be1852af2b942

268 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains critical heuristic firings for XFA heap spraying and embedded script payloads, indicating exploit code execution. ClamAV also detected it as Win.Exploit.JS-296. The presence of XFA JavaScript suggests an attempt to download and execute a second-stage payload, likely exploiting a known PDF vulnerability. The ML classifier strongly supports a malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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.
ClamAV: Win.Exploit.JS-296 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Exploit.JS-296
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.xfa.org/schema/xfa-template/2.5/

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 0xD91	84 bytes
`embedded_file_obj0008.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0xE42	228 bytes
`embedded_file_obj0019.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 19 at offset 0xF33	199 bytes
`embedded_file_obj0010.bin` `31f5aedad71f58cdda2662f0e242f75cc76ccd54d8d2c6562dedfe420c434e1e`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x1024	119 bytes
`embedded_file_obj0018.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x10DB	77 bytes
`embedded_file_obj0015.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0x1182	56 bytes
`embedded_file_obj0001.bin` `6f872a24aad320132a51caea3019627d11a72db23d8e65e767a11eaae07673a2`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x14B6	9098 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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