PDF malware analysis — malicious · 885756b4d849f976

MALICIOUS

PDF

10.8 KB

MD5: fbdb82fc96574b473ac91618e59761f0 SHA-1: 5a4b2b7f0af283e07d5a29c5fa3639aede93dcb8 SHA-256: 885756b4d849f976779127d5f8513a769f4e90d671332d93cc23afb200db4037

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains XFA form elements with embedded JavaScript, identified as a heap spray exploit. This script is designed to download and execute a second-stage payload from the reconstructed URL: http://vcbcszdsdf.sve-vesti.info:80/zXShly?SRUM=13&fRHf=126549. The ML classifier strongly indicates maliciousness, supporting the exploit delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 6

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.
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
String.fromCharCode low PDF_FROMCHARCODE

String.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_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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_000_off00000bee.js` `5d94722da1df5f24568af77a0c6be7937015874fbc4151bfde137c1d425abbd4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xBEE	168880 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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