PDF malware analysis — malicious · 26ff04c0fb3ecb6a

MALICIOUS

PDF

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

MD5: 4fbf7a815f7aabc8003d20dd0f8591bb SHA-1: f489344bef1f6ae91246ed2dd32b8002e1c2501c SHA-256: 26ff04c0fb3ecb6a00fdfcf158875b93681ba7c93ce76d899e5e1abef9817813

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file exhibiting critical XFA heap spray and embedded script payload heuristics. ClamAV detected it as Win.Exploit.JS-296, indicating a known exploit. The XFA JavaScript is likely responsible for the exploit execution, aiming to download and run a second-stage payload. The presence of XFA form elements and embedded JavaScript strongly suggests an exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 8

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.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000e42.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE42	228 bytes
`stream_004_off00001024.bin` `31f5aedad71f58cdda2662f0e242f75cc76ccd54d8d2c6562dedfe420c434e1e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1024	119 bytes
`stream_006_off00001182.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1182	56 bytes
`embedded_pdf_script_0000165b.bin` `ba5eb61aa6636ff8c36d8e44b5f79db14e9ec1ca894679be33a126d68b535518`	pdf-embedded-script	PDF raw stream script payload at offset 0x165B	9074 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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