PDF malware analysis — malicious · 415616d596d105b6

MALICIOUS

PDF

19.7 KB

MD5: 500571fa10e21aff7c5ad8043bd4129d SHA-1: 8493f962604abb5086611804f2a67373fe279a16 SHA-256: 415616d596d105b6b7063dda97c25411747c4b7fe9543d8a9214483be7bd2675

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File Execution: Malicious File

The PDF file contains critical XFA JavaScript heap-spray exploit code and an embedded script payload. ClamAV identified this as Pdf.Dropper.Agent-6293287-0, indicating it likely functions as a dropper for further malicious activity. The presence of XFA and heap-spray techniques strongly suggests an exploit designed to download and execute a second-stage payload.

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-6293287-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6293287-0
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_off00000043.js` `d0d3c9f59ec671be6d7831be37dc6b2a7503a31162e02e1bf8923f44df01c82e`	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 24 long base64-like blob(s).

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