PDF malware analysis — malicious · 42e12d3d45629c03

MALICIOUS

PDF

14.5 KB

MD5: 9cd2118e1a61faf68c37b2fa89fb970c SHA-1: b87f0927530fd2d7620a13a01b9e776926d191d0 SHA-256: 42e12d3d45629c036aca781881867a4a77b7b3a5bc574df4d4c0126a016cb36f

220 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains XFA form elements and exhibits critical heuristic firings for PDF_XFA_HEAP_SPRAY and PDF_EMBEDDED_SCRIPT_PAYLOAD, indicating exploit code within a decompressed JavaScript stream. This stream is likely responsible for downloading and executing a secondary payload, as suggested by the ClamAV detection of 'Pdf.Dropper.Agent-6172432-0'. The ML classifier also strongly flagged this PDF as malicious.

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-6172432-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6172432-0
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` `154ebf93ac3df6a86b403afb1525863eb49ea1881abd96ef348da3a8568e2597`	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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