PDF malware analysis — malicious · 1ec8a4d209c1c46c

MALICIOUS

PDF

14.4 KB

MD5: b3540108c430635a638c71cd5007932f SHA-1: 433e6f78c950ff8eb804844ea58be5b67b04ab52 SHA-256: 1ec8a4d209c1c46c8cda124e00357d302b00869e002a0b6c902e13f539f545bb

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains XFA form elements and exhibits critical heap spray exploit code within a decoded stream, indicating a targeted vulnerability exploitation. A high-confidence ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript payload, likely decompressed from a PDF stream, is the primary mechanism for delivering the malicious content, suggesting it downloads and executes a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 6

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: Pdf.Dropper.Agent-1846538 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1846538
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_000_off00000043.js` `808c2900f3e3f4d04989ef1de01e6b5cebf94ca536b85e7485cdbb5100608588`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x43	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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