PDF malware analysis — malicious · 907722c08e013080

MALICIOUS

PDF

18.5 KB

MD5: d485ea270c98492b7c340a1a470fdd89 SHA-1: b9537513ef7ecc745309f4cb35871b8893e1c97e SHA-256: 907722c08e013080fa33a681b9ec0d52b2d0f7e8e426c3356c35a8d8f891656d

188 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains XFA form elements and embedded JavaScript, identified as a heap-spray exploit. Heuristics indicate it's a dropper, and ML classification strongly supports maliciousness. ClamAV also detected it as Pdf.Dropper.Agent-6290677-0. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9964

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-6290677-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6290677-0
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_off00000047.js` `03ad82e6a8a10e72509116abafdff39a843f990cd7203ffc8a4948ba4779a16d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x47	4194304 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 22 long base64-like blob(s).

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