PDF malware analysis — malicious · f67a5a9a384142e9

MALICIOUS

PDF

43.1 KB

MD5: 17888d779c6b7fbaab6a6a6ab4a84fc8 SHA-1: a4d26e46b32e4e1bec3b0b4d7b1574941270c707 SHA-256: f67a5a9a384142e9100057615e0e93377fa85f3dd90453f40b656654fcbed1cb

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 that triggers a heap spray exploit. This script is designed to download and execute a second-stage payload from the reconstructed URL 'http://werttewewetrwewetrwewetrwewetrywtrwry.uni.me:80/vmUnUZ?gRLp=12&rxfF=12551'. The ML classifier strongly indicates maliciousness, and the presence of exploit code confirms a high-risk attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9880

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_off00000bfd.js` `5427ab1011ef927197185237a48076b7974886ae246c530ee2c0bf69760a583d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xBFD	449256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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